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- W2259382042 abstract "Let Ps be the s-dimensional complex projective space, and let X,Y be two non-empty open subsets of Ps in the Zariski topology. A hypersurface H in Ps×Ps induces a bipartite graph G as follows: the partite sets of G are X and Y, and the edge set is defined by u¯∼v¯ if and only if (u¯,v¯)∈H. Motivated by the Turán problem for bipartite graphs, we say that H∩(X×Y) is (s,t)-grid-free provided that G contains no complete bipartite subgraph that has s vertices in X and t vertices in Y. We conjecture that every (s,t)-grid-free hypersurface is equivalent, in a suitable sense, to a hypersurface whose degree in y¯ is bounded by a constant d=d(s,t), and we discuss possible notions of the equivalence. We establish the result that if H∩(X×P2) is (2,2)-grid-free, then there exists F∈C[x¯,y¯] of degree ≤2 in y¯ such that H∩(X×P2)={F=0}∩(X×P2). Finally, we transfer the result to algebraically closed fields of large characteristic." @default.
- W2259382042 created "2016-06-24" @default.
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- W2259382042 date "2018-06-01" @default.
- W2259382042 modified "2023-09-30" @default.
- W2259382042 title "Bipartite algebraic graphs without quadrilaterals" @default.
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- W2259382042 doi "https://doi.org/10.1016/j.disc.2018.03.005" @default.
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