[4,3]-Configurations with Many Symmetries:Dedicated to memory of my admired teacher, Aryeh Dvoretzky,who passed away earlier today (May 8, 2008)

摘要

A family of points and lines in the Euclidean or projectiveplane is called a [q,k]-configuration provided each of the points isincident with precisely q of the lines, and each line with precisely kof the points. If there are p points and n lines, we say that it is a(pq,n_k) configuration. If q = k then obviously p n, and we talkabout a k-configuration or an (n_k) configuration.