A weighted Complete Intersection conjecture for Lagrangians

Let GG be a tt-intersecting rr-graph, meaning that any two edges of GG have intersection of size at least tt. For integers t1t\geq 1, i0i\geq 0, and rt+ir\geq t+i, let F(r,t,i)F(r,t,i) be the (r)(\leq r)-graph on [t+2i][t+2i] whose edges have sizes between t+it+i and rr. For a weighting p:[t+2i]+[0,1]p:[t+2i]^+\to[0,1], write wp(F(r,t,i))w_p(F(r,t,i)) for the corresponding weighted edge sum, and require (F(r,t,i),t+2i,p)(F(r,t,i),t+2i,p) to be a weighted tt-intersecting set system. Weighted Complete Intersection conjecture. Then

r!λ(G)max0irtwp(F(r,t,i)),r!\lambda(G)\leq\max_{0\leq i\leq r-t}w_p(F(r,t,i)),

where the maximum is implicitly taken over all such weightings pp. This would extend the Complete Intersection Theorem from edge counts to Lagrangians of tt-intersecting rr-graphs; the supplied text presents it as a question toward a complete intersection theorem, and gives no resolution.

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Primary source

Adam Bene Watts, Sergey Norin and Liana Yepremyan, “A Turán theorem for extensions via an Erdős-Ko-Rado theorem for Lagrangians”, arXiv:1707.01533 (2017).

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