Raphael Steiner, Congruence-constrained subdivisions in digraphs
I will present the short proof from that for every digraph F and every assignment of pairs of integers $(r_e,q_e)_{e\in A(F)}$ to its arcs, there exists an integer $N$ such …
10 events found.
Virtual Discrete Math Colloquium
Events
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Zoom ID: 869 4632 6610 (ibsdimag)
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Dömötör Pálvölgyi, C-P3O: Orientation of convex sets and other good covers
Zoom ID: 870 0312 9412 (ibsecopro) [CLOSED]We introduce a novel definition of orientation on the triples of a family of pairwise intersecting planar convex sets and study its properties. In particular, we compare it to other …
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Mehtaab Sawhney, Anticoncentration in Ramsey graphs and a proof of the Erdős-McKay conjecture
Zoom ID: 870 0312 9412 (ibsecopro) [CLOSED]An $n$-vertex graph is called $C$-Ramsey if it has no clique or independent set of size $C\log_2 n$ (i.e., if it has near-optimal Ramsey behavior). We study edge-statistics in Ramsey …
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Santiago Guzmán-Pro, Local expressions of graphs classes
Zoom ID: 869 4632 6610 (ibsdimag)A common technique to characterize hereditary graph classes is to exhibit their minimal obstructions. Sometimes, the set of minimal obstructions might be infinite, or too complicated to describe. For instance, for any …
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Konstantin Tikhomirov, A remark on the Ramsey number of the hypercube
Zoom ID: 870 0312 9412 (ibsecopro) [CLOSED]A well-known conjecture of Burr and Erdős asserts that the Ramsey number $r(Q_n)$ of the hypercube $Q_n$ on $2^n$ vertices is of the order $O(2^n)$. In this paper, we show that …
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Hugo Jacob, On the parameterized complexity of computing tree-partitions
Zoom ID: 869 4632 6610 (ibsdimag)Following some recent FPT algorithms parameterized by the width of a given tree-partition due to Bodlaender, Cornelissen, and van der Wegen, we consider the parameterized problem of computing a decomposition. …
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Chong Shangguan (上官冲), On the sparse hypergraph problem of Brown, Erdős and Sós
Zoom ID: 224 221 2686 (ibsecopro)For fixed integers $r\ge 3, e\ge 3$, and $v\ge r+1$, let $f_r(n,v,e)$ denote the maximum number of edges in an $n$-vertex $r$-uniform hypergraph in which the union of arbitrary $e$ …
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Cosmin Pohoata, Convex polytopes from fewer points
Zoom ID: 224 221 2686 (ibsecopro)Finding the smallest integer $N=ES_d(n)$ such that in every configuration of $N$ points in $\mathbb{R}^d$ in general position, there exist $n$ points in convex position is one of the most …
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Maya Sankar, Homotopy and the Homomorphism Threshold of Odd Cycles
Zoom ID: 224 221 2686 (ibsecopro)Fix $r \ge 2$ and consider a family F of $C_{2r+1}$-free graphs, each having minimum degree linear in its number of vertices. Such a family is known to have bounded …
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Pedro Montealegre, A Meta-Theorem for Distributed Certification
Zoom ID: 869 4632 6610 (ibsdimag)Distributed certification, whether it be proof-labeling schemes, locally checkable proofs, etc., deals with the issue of certifying the legality of a distributed system with respect to a given boolean predicate. A certificate …