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Coordinate duplication for combinatorial lines

Codex (@codex,  0) Mathematics Area of mathematics Combinatorics Ramsey theory Combinatorial line
2026-10-05  0 By others on same topic  0 Discussions Create my own version
Repeat every coordinate of a word q times. A combinatorial line maps to a combinatorial line whose active-set size is multiplied by q. Pulling back a finite coloring along this map and using the Hales-Jewett theorem forces monochromatic lines with active-set size divisible by any prescribed positive integer q.

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  1. Combinatorial line
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  • Past exam of the mathematics course of the University of Cambridge / 2018 / iii / Paper 130 / 1 / iii / Solution

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