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1 Harmonic Functions and the Mean-Value Property |
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1 | (32) |
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1 | (3) |
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1.2 Mean-Value Property and Smoothness |
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4 | (2) |
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6 | (1) |
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1.4 The Laplace-Beltrami Operator on Spheres |
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7 | (12) |
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1.5 Harnack's Monotone Convergence Theorem |
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19 | (1) |
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1.6 Interior Estimates and Uniform Gradient Bounds |
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20 | (3) |
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1.7 Weyl's Lemma on Weakly Harmonic Functions |
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23 | (1) |
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1.8 Exercises and Further Results |
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24 | (9) |
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2 Poisson Kernels and Green's Representation Formula |
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33 | (42) |
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2.1 The Fundamental Solution N of Δ |
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34 | (2) |
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2.2 Green's Identities and Representation Formulas |
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36 | (5) |
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2.3 The Green's Function G = G(x,y; Ω) |
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41 | (3) |
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2.4 The Poisson Kernel P = P(x,y; Ω) |
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44 | (1) |
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2.5 Explicit Constructions: Balls |
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45 | (7) |
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2.6 Explicit Constructions: Half-Spaces |
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52 | (1) |
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2.7 The Newtonian Potential N[ f; Ω] |
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53 | (6) |
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2.8 Decay of the Newtonian Potential |
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59 | (2) |
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2.9 Second Order Derivatives and ΔN[ f; Ω] |
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61 | (5) |
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2.10 Exercises and Further Results |
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66 | (9) |
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3 Abel-Poisson and Fejer Means of Fourier Series |
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75 | (50) |
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3.1 Function Spaces on the Circle |
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76 | (3) |
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3.2 Conjugate Series; Magnitude of Fourier Coefficients |
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79 | (3) |
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3.3 Summability Methods; Tauberian Theorems |
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82 | (4) |
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3.4 Abel-Poisson vs. Fejer Means of Fourier Series |
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86 | (5) |
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3.5 L1(T) and M(T) as Convolution Banach Algebras |
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91 | (8) |
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3.6 Approximation to Identity: Strong Convergence in C and Lp (p < ∞) |
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99 | (5) |
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3.7 Approximation to Identity: Weak* Convergence in M and L∞ |
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104 | (4) |
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3.8 The Riemann-Lebesgue Lemma; An Isomorphism of L1(T) into c0(Z) |
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108 | (3) |
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3.9 A Primer of Peter-Weyl Theory: Characters and Orthogonality in L2(T) |
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111 | (3) |
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3.10 Exercises and Further Results |
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114 | (11) |
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4 Convergence of Fourier Series: Dini vs. Dirichlet-Jordon |
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125 | (26) |
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4.1 The Wiener Algebra of the Circle A(T) |
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125 | (3) |
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4.2 Pointwise Convergence of Fourier Series |
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128 | (5) |
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4.3 Riemann's Localisation Principle |
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133 | (1) |
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4.4 Dini and Marcinkiewicz Convergence Criteria |
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133 | (2) |
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4.5 Dirichlet-Jordan Convergence Criterion |
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135 | (2) |
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4.6 The Frechet-Schwartz Space D(T) |
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137 | (3) |
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4.7 The Hilbert-Sobolev Spaces Hs(T) (-∞ < s < ∞) |
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140 | (4) |
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4.8 Exercises and Further Results |
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144 | (7) |
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5 Harmonic-Hardy Spaces hp(D) |
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151 | (34) |
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5.1 The Poisson Kernel P(x, y; D) |
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151 | (4) |
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5.2 The Dirichlet Problem in a Jordan Domain |
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155 | (2) |
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5.3 Nodal Sets and the Rado-Kneser-Choquet Theorem |
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157 | (5) |
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5.4 Poisson Integrals in Lp(T) (1 < p < ∞) |
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162 | (3) |
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5.5 Poisson Integrals in M(T) |
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165 | (3) |
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5.6 Non-Tangential Convergence |
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168 | (3) |
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5.7 Characterisation of Harmonic-Hardy Spaces hp(D) |
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171 | (3) |
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5.8 Harmonic Conjugation on hp(D) (1 ≤ p ≤ ∞) |
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174 | (3) |
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5.9 Hadamard's Three Lines Theorem |
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177 | (1) |
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5.10 Exercises and Further Results |
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177 | (8) |
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6 Interpolation Theorems of Marcinkiewicz and Riesz-Thorin |
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185 | (62) |
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6.1 Interpolation of Integral Operators on Lp(X, 21, μ) |
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185 | (7) |
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6.2 Integration via the Distribution Function |
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192 | (3) |
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6.3 Marcinkiewicz Spaces Lpw(X, μ) |
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195 | (4) |
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6.4 Real Interpolation Method of Marcinkiewicz: The Diagonal Case |
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199 | (7) |
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6.5 Complex Interpolation Method of Riesz-Thorin |
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206 | (6) |
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6.6 The Hausdorff-Young and Hardy-Littlewood-Paley Inequalities |
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212 | (2) |
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6.7 Real Interpolation Method of Marcinkiewicz: The General Case |
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214 | (5) |
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6.8 Decreasing Rearrangements; The Maximal Function Operator M[ f*] |
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219 | (6) |
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6.9 The Lorentz Spaces Lp,q(X, μ) and Interpolation |
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225 | (8) |
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6.10 Exercises and Further Results |
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233 | (14) |
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7 The Hilbert Transform on Lp(T) and Riesz's Theorem |
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247 | (28) |
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7.1 Fourier Partial Sums and Riesz Projection on Lp(T)(1 ≤ p < ∞) |
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247 | (4) |
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7.2 Higher Regularity of u = P[ f] Up to the Boundary |
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251 | (2) |
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7.3 The Hilbert Transform on L1(T); Existence a.e. and Finiteness |
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253 | (4) |
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7.4 The Hilbert Transform as an L2-Multiplier Operator |
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257 | (2) |
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7.5 Kolmogoroff's Theorem: The L1-weak Estimate on H |
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259 | (3) |
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7.6 Riesz's Theorem: The Lp-Boundedness of H (1 < p < ∞) |
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262 | (3) |
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7.7 Zygmund's L log L Theorem and its Converse |
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265 | (1) |
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7.8 Riesz Projection and the Lp-Convergence of Fourier Series (1 < p < ∞) |
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266 | (1) |
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7.9 Exercises and Further Results |
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267 | (8) |
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8 Harmonic-Hardy Spaces hp(Bn) |
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275 | (34) |
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8.1 The Poisson Kernel P(x, y; Bn) |
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275 | (4) |
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8.2 Poisson Integrals in Lp(Sn-1) (1 ≤ p ≤ ∞) and M(Sn-1) |
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279 | (5) |
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8.3 Characterisation of Harmonic-Hardy Spaces hp(Bn) |
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284 | (1) |
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8.4 Herglotz's Theorem on Positive Harmonic Functions |
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285 | (1) |
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8.5 H.A. Schwarz's Reflection Principle; Removable Singularities |
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286 | (3) |
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8.6 Non-Tangential Maximal Function; Stoltz Domains Ωα(y) in Bn |
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289 | (3) |
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8.7 A Spectral Decomposition of L2(Sn-1) via Spherical Harmonics |
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292 | (1) |
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8.8 Orthogonal Projection of L2(Sn-1) onto Hj; Zonal Harmonics |
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293 | (6) |
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8.9 Exercises and Further Results |
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299 | (10) |
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9 Convolution Semigroups; The Poisson and Heat Kernels on Rn |
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309 | (42) |
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9.1 Convolutions in Co(Rn), Lp(Rn) and M(Rn) |
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309 | (4) |
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9.2 L1(Rn) and M(Rn) as Convolution Banach Algebras |
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313 | (3) |
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9.3 Approximation to Identity: Strong Convergence in Co and Lp (p < ∞) |
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316 | (3) |
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9.4 Approximation to Identity: Weak* Convergence in M and L∞ |
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319 | (1) |
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9.5 Young's Convolution Inequality: Lr(Rn) * Lp(Rn) ⊂ Lq(Rn) |
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320 | (1) |
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9.6 Friedrich Mollifiers and Approximation by Smooth Functions |
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321 | (4) |
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9.7 Continuity of Riesz Potentials byway of Young's Inequality |
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325 | (6) |
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9.8 Lp Norm for Vector p; The Loomis-Whitney Inequality and Beyond |
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331 | (3) |
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9.9 Exercises and Further Results |
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334 | (17) |
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10 Perron's Method of Sub-Harmonic Functions |
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351 | (42) |
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10.1 Upper Semicontinuous Functions |
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351 | (2) |
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10.2 Sub-Harmonic Functions Revisited |
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353 | (4) |
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10.3 Perron's Existence Theorem |
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357 | (2) |
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10.4 Barriers and the Boundary Regularity of Perron's Solution |
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359 | (2) |
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10.5 Potentials; Capacity and Wiener's Criterion |
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361 | (13) |
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10.6 Harmonic Measure; Generalised Poisson Integrals |
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374 | (2) |
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10.7 The Riemann Mapping Theorem via Green's Functions |
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376 | (2) |
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10.8 Hardy's Theorem on the Convexity of log Mp[ f; r] |
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378 | (2) |
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10.9 Solvability of the Poisson Equation; C2, α Estimates on N[ f; Ω] |
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380 | (4) |
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10.10 Exercises and Further Results |
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384 | (9) |
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11 From Abel-Poisson to Bochner-Riesz Summability |
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393 | (44) |
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11.1 The L1 Theory of Fourier Transform |
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393 | (6) |
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11.2 Abel-Poisson vs. Gauss-Weierstrass Summability of Integrals |
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399 | (2) |
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11.3 Fourier Inversion Formula on L1(Rn) |
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401 | (3) |
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11.4 The Schwartz Space S(Rn) as a Frechet Space |
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404 | (7) |
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11.5 Fourier-Plancherel Transform and the L2 Theory |
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411 | (3) |
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11.6 The Calderon-Zygmund Decomposition Lemma |
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414 | (2) |
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11.7 Summability of Fourier Integrals; Fefferman's Ball Multiplier |
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416 | (4) |
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11.8 Bochner-Riesz Summability |
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420 | (2) |
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11.9 Exercises and Further Results |
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422 | (15) |
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12 Fourier Transform on S'(Rn); The Hilbert-Sobolev Spaces Hs(Rn) |
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437 | (64) |
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12.1 S'(Rn) as a Dual Space |
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437 | (4) |
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12.2 Fourier Transform on S'(Rn) |
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441 | (8) |
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12.3 (Lp, Lq) Operators Commuting with Translations |
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449 | (4) |
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12.4 Fractional Integration and (-Δ)-α/2 (0 < α < n) |
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453 | (3) |
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12.5 Lp-Estimates: Poisson, Heat and Schrodinger Semigroups |
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456 | (3) |
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12.6 The Wave Kernel Wt; The Light Cone and Huygens Principle |
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459 | (3) |
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12.7 The Hilbert-Sobolev Spaces Hs(Rn) (-∞ < s < ∞) |
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462 | (5) |
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12.8 Trace Theorems and Restrictions in Hs(Rn) |
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467 | (1) |
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12.9 Extensions and a Theorem of Slobodeckij |
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468 | (2) |
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12.10 Exercises and Further Results |
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470 | (11) |
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481 | |
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1 | (500) |
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13 Maximal Function; Bounding Averages and Pointwise Convergence |
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501 | (48) |
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13.1 A Covering Lemma of Vitali Type |
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501 | (3) |
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13.2 The Hardy-Littlewood Maximal Function |
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504 | (3) |
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13.3 Applications to Differentiability |
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507 | (2) |
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13.4 Approximation to Identity: Pointwise Convergence and Bounds |
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509 | (7) |
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13.5 Local L1-Integrability of M[ f] and Stein's L log L Theorem |
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516 | (2) |
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13.6 Lp-Boundedness of Riesz Potentials via Maximal Function |
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518 | (6) |
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13.7 Young's Convolution Inequality: Lrw(Rn) * Lp(Rn) ⊂ Lq(Rn) |
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524 | (2) |
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13.8 The Maximal Operator T*; Pointwise Convergence of Operator Families (Tεf) |
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526 | (4) |
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13.9 Exercises and Further Results |
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530 | (19) |
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14 Harmonic-Hardy Spaces hp(H) |
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549 | (40) |
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14.1 The Poisson Kernel P(ξ, ζ H) |
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549 | (4) |
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14.2 Poisson Integrals in Lp(Rn) (1 ≤ p ≤ ∞) and M(Rn) |
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553 | (2) |
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14.3 Characterisation of Harmonic-Hardy Spaces hp(H) |
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555 | (1) |
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14.4 Non-Tangential Convergence to Boundary Values |
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556 | (3) |
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14.5 The Hardy-Littlewood Maximal Function on Spheres |
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559 | (5) |
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14.6 Mobius Maps; The Kelvin Transform K[ u] |
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564 | (3) |
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14.7 Functions Harmonic at Infinity |
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567 | (7) |
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14.8 Positive Harmonic Functions in Rn+ |
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574 | (3) |
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14.9 Exercises and Further Results |
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577 | (12) |
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15 Sobolev Spaces Wk,p(Ω); A Resolution of the Dirichlet Principle |
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589 | (56) |
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15.1 Calculus of Weak Derivatives |
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589 | (5) |
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15.2 Wk,p-Approximation by Smooth Functions |
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594 | (4) |
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15.3 Trace Theorem for W1,p(Ω); The Zero Trace Space Wk,p0(Ω) |
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598 | (6) |
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15.4 Poincare Inequality; Equivalent Norms on Wk,p0 |
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604 | (3) |
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15.5 Gagliardo-Nirenberg-Sobolev Inequality |
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607 | (8) |
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15.6 Embedding Theorems for Wk,p0 and Wk,p |
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615 | (5) |
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15.7 Rellich-Kondrachov Compactness Theorem |
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620 | (3) |
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15.8 The Spectrum of -Δ and the Perron-Frobenius Theorem |
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623 | (4) |
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15.9 Exercises and Further Results |
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627 | (18) |
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16 Singular Integral Operators and Vector-Valued Inequalities |
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645 | (56) |
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16.1 The Hilbert Transform on Lp(R); Riesz's Theorem by Complex Methods |
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646 | (5) |
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16.2 The Maximal Hilbert Transforms; Riesz's Theorem by Real Methods |
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651 | (6) |
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16.3 Singular Integrals of Calderon-Zygmund Type |
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657 | (3) |
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16.4 The Riesz Transforms Rj(1 ≤ j ≤ n) on Lp(Rn) and Beyond |
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660 | (3) |
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16.5 Homogeneous Kernels: L2-Boundedness |
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663 | (5) |
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16.6 Homogeneous Kernels: Lp-Theory (1 ≤ p < ∞) |
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668 | (2) |
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16.7 The Calderon-Zygmund Method of Rotations |
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670 | (5) |
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16.8 Vector-Valued Inequalities; Vector-Valued Singular Integrals |
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675 | (3) |
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16.9 More on the Newtonian Potential N[ f; Ω] |
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678 | (8) |
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16.10 Exercises and Further Results |
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686 | (15) |
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17 Littlewood-Paley Theory, Lp-Multipliers and Function Spaces |
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701 | (50) |
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17.1 Littlewood-Paley Theory on the Line |
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701 | (5) |
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17.2 Littlewood-Paley Theory on the Euclidean n-Space: Part I |
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706 | (6) |
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17.3 Littlewood-Paley Theory on the Euclidean n-Space: Part II |
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712 | (4) |
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17.4 The Hormander-Mihlin Multiplier Theorem |
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716 | (2) |
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17.5 A Littlewood-Paley Characterisation of Hs(Rn) and More |
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718 | (3) |
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17.6 Applications to Strichartz Estimates for the Wave Equation |
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721 | (6) |
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17.7 Slobodeckij Spaces Ws,p(Rn) and Bessel Potential Spaces Hsp(Rn) |
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727 | (5) |
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17.8 Besov Spaces Bsp,q(Rn) and Triebel-Lizorkin Spaces Fsp,q(Rn) |
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732 | (2) |
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17.9 Embeddings of Bsp,q(Rn) and Fsp,q(Rn) |
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734 | (3) |
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17.10 Exercises and Further Results |
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737 | (14) |
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18 Morrey and Campanato vs. Hardy and John-Nirenberg Spaces |
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751 | (48) |
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751 | (2) |
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18.2 Campanato Spaces Lp,λ |
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753 | (1) |
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18.3 Relations Between Mp,λ and C0,μ |
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754 | (6) |
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18.4 The John-Nirenberg Space BMO |
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760 | (5) |
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18.5 The Real Hardy Spaces Hp(Rn) (0 < p ≤ ∞) |
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765 | (2) |
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18.6 H1(Rn) and the Div-Curl Lemma |
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767 | (3) |
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18.7 The L log L Integrability of det Δu on W1,n |
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770 | (6) |
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18.8 Gehring's Higher Lp-Integrability Lemma; Reverse Holder Inequalities |
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776 | (3) |
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18.9 Exercises and Further Results |
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779 | (20) |
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19 Layered Potentials, Jump Relations and Existence Theorems |
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799 | (42) |
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19.1 The Potential D = D[ φ; δΩ] of a Double Layer |
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799 | (11) |
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19.2 The Inner and Outer Trace Operators γi, γo; The Jump Relations |
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810 | (1) |
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19.3 The Potential S = S[ φ; δΩ] of a Single Layer |
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811 | (8) |
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19.4 The Inner and Outer Trace Operators γiυ, γ0υ The Jump Relations |
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819 | (2) |
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19.5 Existence Theorems Through the Method of Layered Potentials |
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821 | (1) |
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19.6 Spectral Analysis of T on L2(δΩ) |
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822 | (5) |
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19.7 An Eigen-Space Decomposition of L2(δΩ) |
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827 | (2) |
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19.8 A Resolution of the Dirichlet and Neumann Problems |
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829 | (2) |
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19.9 Exercises and Further Results |
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831 | (10) |
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20 Second Order Equations in Divergence Form: Continuous Coefficients |
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841 | (26) |
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20.1 Caccioppoli Inequality: The Classical Form |
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842 | (3) |
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20.2 Application to Higher Local Integrability of |Δu|2 |
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845 | (3) |
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20.3 A-Harmonic Functions and the Decay Rate of their Integral Means |
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848 | (3) |
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20.4 Comparison with A-Harmonic Functions; Iteration Lemma |
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851 | (2) |
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20.5 L2,λ-Estimates for A-Harmonic Functions |
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853 | (2) |
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20.6 Continuous Coefficients: Gradient M2,λ-Estimates |
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855 | (2) |
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20.7 Gradient Holder Continuity: C1,μ-Estimates (0 < μ < 1) |
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857 | (4) |
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20.8 Exercises and Further Results |
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861 | (6) |
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21 Second Order Equations in Divergence Form: Measurable Coefficients |
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867 | (40) |
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21.1 Caccioppoli Inequality on Level Sets |
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867 | (4) |
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21.2 Local Boundedness of Weak Solutions; De Giorgi's Approach |
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871 | (3) |
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21.3 Holder Continuity of Weak Solutions; Oscillations on Balls |
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874 | (9) |
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21.4 Moser Iteration: Local Boundedness of Weak Solutions |
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883 | (7) |
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21.5 Moser Iteration: Holder Continuity of Weak Solutions |
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890 | (4) |
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21.6 Harnack Inequality and its Consequences |
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894 | (4) |
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21.7 Exercises and Further Results |
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898 | (9) |
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907 | (2) |
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B Total Boundedness and Compact Subsets of Lp |
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909 | (4) |
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C Gamma and Beta Functions |
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913 | (3) |
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D Volume of the Unit n-Ball: ωn = |Bn| |
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916 | (2) |
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E Integrals Related to Abel and Gauss Kernels |
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918 | (4) |
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F The Hausdorff Measure Hs (0 ≤ s < ∞) |
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922 | (5) |
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G Evaluation of Some Integrals Over Sn-1 |
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927 | (2) |
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H Sobolev Spaces W1,p(a, b) |
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929 | (10) |
Bibliography |
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939 | (20) |
Index |
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959 | |