Papers › Exponentially Larger Affine and Projective Caps

Exponentially Larger Affine and Projective Caps

17 Nov 2022arXiv:2211.09772links table onlyarchive 2025-07-28

Christian Elsholtz, Gabriel F. Lipnik

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In spite of a recent breakthrough on upper bounds of the size of cap sets (by Croot, Lev and Pach (2017) and Ellenberg and Gijswijt (2017)), the classical cap set constructions had not been affected. In this work, we introduce a very different method of construction for caps in all affine spaces with odd prime modulus p. Moreover, we show that for all primes p ≡5 6 with p ≤41, the new construction leads to an exponentially larger growth of the affine and projective caps in AG(n,p) and PG(n,p). For example, when p=23, the existence of caps with growth (8.0875…)ⁿ follows from a three-dimensional example of Bose (1947), and the only improvement had been to (8.0901…)ⁿ by Edel (2004), based on a six-dimensional example. We improve this lower bound to (9-o(1))ⁿ.

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