Zarankiewicz’s problem for semilinear hypergraphs
Zarankiewicz’s problem for semilinear hypergraphs
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半线性超图的 Zarankiewicz 问题
DOI:
10.1017/fms.2021.52
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Tran, Chieu-Minh
中科院分区:
文献类型:
--
作者:
Basit, Abdul;Chernikov, Artem;Starchenko, Sergei;Tao, Terence;Tran, Chieu-Minh
A bipartite graph with is semilinear if for some and the edge relation E consists of the pairs of points satisfying a fixed Boolean combination of s linear equalities and inequalities in variables for some s. We show that for a fixed k, the number of edges in a -free semilinear H is almost linear in n, namely for any ; and more generally, for a -free semilinear r-partite r-uniform hypergraph.As an application, we obtain the following incidence bound: given points and open boxes with axis-parallel sides in such that their incidence graph is -free, there can be at most incidences. The same bound holds if instead of boxes, one takes polytopes cut out by the translates of an arbitrary fixed finite set of half-spaces.We also obtain matching upper and (superlinear) lower bounds in the case of dyadic boxes on the plane, and point out some connections to the model-theoretic trichotomy in o-minimal structures (showing that the failure of an almost-linear bound for some definable graph allows one to recover the field operations from that graph in a definable manner).
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DOI:
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