Department of Computer Science | Institute of Theoretical Computer Science | CADMO

Theory of Combinatorial Algorithms

Prof. Emo Welzl and Prof. Bernd Gärtner

Mittagsseminar (in cooperation with M. Ghaffari, A. Steger and B. Sudakov)

Mittagsseminar Talk Information

Date and Time: Thursday, October 27, 2011, 12:15 pm

Duration: 30 minutes

Location: CAB G51

Speaker: Anastasios Zouzias (University of Toronto)

A Matrix Hyperbolic Cosine Algorithm and Applications

In this talk, we will discuss a generalization of Spencer’s hyperbolic cosine algorithm to the matrix-valued setting. Then, we will apply the proposed algorithm on two graph theoretic problems and obtain fast deterministic algorithms for these problems. That is, we will describe a near-optimal deterministic algorithm that, given the multiplication table of a finite group of size n, constructs an Alon-Roichman expanding Cayley graph of logarithmic degree in O(n2 log3 n) time. Second, we will give a fast deterministic algorithm for spectral graph sparsification of dense graphs building on the work of Spielman and Srivastava.


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