Geometries and Groups: Proceedings of a Colloquium Held at the Freie Universität Berlin, May 1981: Lecture Notes in Mathematics, cartea 893

The basic diagram of a geometry.- Linear spaces and steiner systems.- On designs.- Some remarks on representation theory in finite geometry.- Geometry and Loops.- On possible orders of noncommutative tactical spaces.- Mathieu groups, With designs, and Golay codes.- Extending strongly resolvable designs.- Some unitals on 28 points and their embeddings in projective planes of order 9.- The large with design—Materialized.- k-difference-cycles and the construction of cyclic t-designs.- Characterization of biplanes by their automorphism groups.- Ein Einfacher Beweis für den Satz von Zsigmondy über primitive Primeiler von AN-1.- On a class of edge-regular graphs.- Geometries uniquely embeddable in projective spaces.- Strong point stable designs.