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Tag Archives: switching
Carries, shuffling, and cocycles
Last week we were treated to a lovely lecture by Persi Diaconis. As he so often does, he started with an elementary question: how many carries do you expect if you add n numbers in base b? From there he … Continue reading
Posted in exposition, open problems
Tagged arithmetic, minimal cocycles, riffle shuffles, Seidel, switching
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The Graph Extension Theorem
I made some notes on the Graph Extension Theorem for a new research project. They may be of wider interest, so here is a summary. Shult’s Graph Extension Theorem is a simple device for showing that certain permutation groups have … Continue reading
Posted in exposition
Tagged Higman, Seidel, Shult, switching, transitive extension, two-graph
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