Exact Algorithms for Some Graph Coloring and Covering Problems

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Tuesday, 13 June 2017, 11:00 to 12:00

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Inclusion-Exclusion based methods will be presented for solving exactly some graph coloring and covering problems. In particular this solves the problem of finding the Chromatic number of a graph in $O^*(2^n)$ time, which was open till 2006 (Björklund and Husfeldt, FOCS 2006). Then, an alternate approach of using Fast Subset Convolution will be presented: this generalizes the Inclusion-Exclusion based methods at a cost. Finally, an algorithm for computing the b-fold Fractional Chromatic number in $O^*(2^{(n log(2b))})$ time, will be presented.