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Tag Archives: primitive group
Primitive switching classes
Last year I wrote here about switching classes of graphs for which the switching class has a primitive automorphism group. (I repeat the definitions briefly below.) I conjectured that, except for the trivial switching classes of the complete and null … Continue reading
Posted in exposition, mathematics
Tagged Akos Seress, Don Taylor, Pablo Spiga, primitive group, switching class, twograph
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Symmetry versus regularity
In my report on CAMconf, I didn’t mention Laci Babai’s talk, whose title was the same as that of this post. This was a talk that needed some thinking about. I want to describe the situation briefly, and then pose … Continue reading
Posted in events, exposition, open problems
Tagged primitive group, Seidel switching, Steiner system, strongly regular graph, switching class
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Primitivity
The first mathematics book that I read really seriously was Helmut Wielandt’s Finite Permutation Groups. So I have known the definition of a primitive permutation group for more than forty years. But there is still more to learn. My recent … Continue reading
Posted in exposition, open problems
Tagged graph, primitive group, semigroup, synchronization
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