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EVENT: Groups and Combinatorics Seminar: Orbital graphs

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Today's date is Friday, October 30, 2020
Groups and Combinatorics Seminar: Orbital graphs Other events...
Speaker: Rebecca Waldecker (Martin-Luther-Universitšt Halle-Wittenberg)

Time and place: 16:00 Friday 10/03/2017 in Weatherburn LT

Title: Orbital graphs

Abstract: In joint work with Markus Pfeiffer and Chris Jefferson (both in St Andrews) I got interested in algorithms for permutation groups, in particular search algorithms that use partition backtracking. Typical examples would be algorithms that calculate the intersection of two permutation groups, a set stabiliser in a given group or the normaliser of a subgroup. We noticed that some algorithms could be improved by exploiting some group action, and this is where graphs enter the scene. In my talk I will introduce orbital graphs in this specific context and explain how they improve our algorithms. Moreover I will discuss in detail why, sometimes, these graphs do not help at all!
Contact Stephen Glasby <[email protected]>
Start Mon, 06 Mar 2017 10:00
End Mon, 06 Mar 2017 11:00
Submitted by Stephen Glasby <[email protected]>
Last Updated Tue, 07 Mar 2017 12:00
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