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Thursday, October 24, 2019 1:00 pm - 1:00 pm EDT (GMT -04:00)

Algebraic Graph Theory Seminar - Xiaohong Zhang

Title:ÌýPerfect state transfer on Hadamard diagonalizable graphs

Speaker: Xiaohong Zhang
Affiliation: University of À¶Ý®ÊÓÆµ
Room: MC 5479

Abstract:

A (weighted) graph whose Laplacian matrix is diagonalizable by a Hadamard matrix is said to be Hadamard diagonalizable.

Thursday, October 24, 2019 4:00 pm - 4:00 pm EDT (GMT -04:00)

Graphs and Matroids Seminar - Rose McCarty

Title:ÌýSublinear separators in intersection graphs of convex shapes

Speaker: Rose McCarty
Affiliation: University of À¶Ý®ÊÓÆµ
Room: MC 5501

Abstract:Ìý

A balanced separator of an n-vertex graph is set of vertices whose deletion leaves only components of size at most 2n/3.

Wednesday, October 30, 2019 3:30 pm - 3:30 pm EDT (GMT -04:00)

Joint C&O/PureMath Colloquium - Hayley Reid

Title:ÌýCutting a square into triangles of equal area

Speaker: Hayley Reid
Affiliation: University of À¶Ý®ÊÓÆµ
Room:Ìý MC 5501

Abstract:

Suppose you are given a square and asked to cut it into n triangles of equal area. If n is even the problem is almost trivial, but when n is odd the problem becomes much harder.

Thursday, October 31, 2019 4:00 pm - 4:00 pm EDT (GMT -04:00)

Graphs and Matroids Seminar - James Davies

Title:ÌýEdge-maximal graphs on surfaces

Speaker: James Davies
Affiliation: University of À¶Ý®ÊÓÆµ
Room: MC 5501

Abstract:

It is straightforward to show that, with the exception ofÌýsmall complete graphs, every edge-maximal planar graphÌýtriangulates the plane.

Friday, November 1, 2019 1:00 pm - 1:00 pm EDT (GMT -04:00)

Combinatorial Optimization Reading Group - Zishen Qu

Title:ÌýMaximizing non-monotone submodular functions

Speaker: Zishen Qu
Affiliation: University of À¶Ý®ÊÓÆµ
Room: MC 5417

Abstract:

Optimization of non-monotone submodular functions has applications in the maximum cut and maximum directed cut problems for graphs.

Friday, November 1, 2019 3:30 pm - 3:30 pm EDT (GMT -04:00)

Tutte Collouium - Luke Schaeffer

Title:ÌýA Quantum Query Complexity Trichotomy for Regular Languages

Speaker: Luke Schaeffer
Affiliation: University of À¶Ý®ÊÓÆµ
Room: MC 5501

Abstract:

We consider theÌýquantumÌýquery complexity of regular languages and discover a surprising trichotomy: each regular language has query complexity either Theta(1), ~Theta(sqrt(n)) or Theta(n).Ìý