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El. knyga: Combinatorics of Spreads and Parallelisms

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(University of Iowa, Iowa City, USA)
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Combinatorics of Spreads and Parallelisms covers all known finite and infinite parallelisms as well as the planes comprising them. It also presents a complete analysis of general spreads and partitions of vector spaces that provide groups enabling the construction of subgeometry partitions of projective spaces.

The book describes general partitions of finite and infinite vector spaces, including Sperner spaces, focal-spreads, and their associated geometries. Since retraction groups provide quasi-subgeometry and subgeometry partitions of projective spaces, the author thoroughly discusses subgeometry partitions and their construction methods. He also features focal-spreads as partitions of vector spaces by subspaces. In addition to presenting many new examples of finite and infinite parallelisms, the book shows that doubly transitive or transitive t-parallelisms cannot exist unless the parallelism is a line parallelism.

Features

-Covers general partitions of vector spaces, emphasizing focal-spreads and extended generalized AndrT spreads

-Explains how novel constructions provide retraction groups that allow a large number of new subgeometry partitions of projective spaces

-Offers a thorough treatment of parallelisms of projective spaces

-Lists more than 70 open problems that encompass many new areas of research

Along with the author's other three books, this text forms a solid, comprehensive account of the complete theory of the geometries that are connected with translation planes in intricate ways. It explores how to construct interesting parallelisms and how general spreads of vector spaces are used to study and construct subgeometry partitions of projective spaces.

Partitions of Vector Spaces. Subgeometry Partitions. Subplane Covered Nets and Baer Groups. Flocks and Related Geometries. Derivable Geometries. Constructions of Parallelisms. Parallelism-Inducing Groups. Coset Switching. Transitivity. Appendices. Bibliography. Index.

Norman L. Johnson is a professor in the Department of Mathematics at the University of Iowa.
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