Off-diagonal semi-algebraic Ramsey bound

For integers k3k\geq 3, dimension dd, complexity tt, and ss, let Rkd,t(s,n)R_k^{d,t}(s,n) be the least integer NN such that every sequence of NN points in Rd\mathbb{R}^d and every kk-ary semi-algebraic relation of complexity at most tt contains either ss points all of whose induced kk-tuples belong to the relation or nn points none of whose induced kk-tuples belong to it. Off-diagonal semi-algebraic Ramsey conjecture. For fixed k3,d,tk\geq 3,d,t, and ss, there is a constant c=c(k,d,t,s)c=c(k,d,t,s) such that

Rkd,t(s,n)twrk2(nc).R_k^{d,t}(s,n)\leq \operatorname{twr}_{k-2}(n^c).

This would improve the general tower-height upper bound by one level in the off-diagonal case. The paper presents it as a stronger expected bound, with the crucial k=3k=3 case conjectured separately in polynomial form.

Sources & referencesView supporting material

Primary source

David Conlon, Jacob Fox, János Pach, Benny Sudakov and Andrew Suk, “Ramsey-type results for semi-algebraic relations”, arXiv:1301.0074 (2013).

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