Iterated Point-Line Configurations Grow Doubly-Exponentially

Details Iterated Point-Line Configurations Grow Doubly-Exponentially Iterated Point-Line Configurations Grow Doubly-Exponentially

2008-07-09

arxiv.org/abs/0807.1549v1

Mathematics

Combinatorics

13 pages, 0 figures

Scientific paper

Begin with a set of four points in the real plane in general position. Add to this collection the intersection of all lines through pairs of these points. Iterate. Ismailescu and Radoi\v{c}i\'{c} (2003) showed that the limiting set is dense in the plane. We give doubly exponential upper and lower bounds on the number of points at each stage. The proof employs a variant of the Szemer\'edi-Trotter Theorem and an analysis of the ``minimum degree'' of the growing configuration.

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