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Tag Archives: derangements
More on derangements
Francis Bacon, in The New Organon, developed a famous metaphor: Those who have handled sciences have been either men of experiment or men of dogmas. The men of experiment are like the ant, they only collect and use; the reasoners … Continue reading
Perth, week 1
The first week of the visit is over. The weather has been quite cold, but it is likely to improve as time goes on. The best day so far was yesterday, when we went to Yanchep National Park and had … Continue reading
Posted in doing mathematics, exposition
Tagged derangements, H. Zantema, Jordan's theorem
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Green on derangements
I have to mention Ben Green again. Yesterday he gave a lovely colloquium talk on a problem I had cracked my head against some years ago without much success. As usual with derangements, the story begins with a classical result: … Continue reading
Asymptotic group theory, 2
Inna Capdeboscq started proceedings this morning with a talk about one small part of the secondgeneration (Gorenstein–Lyons–Solomon) proof of the Classification of Finite Simple Groups. What she described will be volume 8 of the complete proof, if I remember correctly. … Continue reading
Finding derangements without CFSG
Nearly two years ago, I posed the problem of finding an “elementary” deterministic polynomialtime algorithm for finding a fixedpointfree element (or derangement) in a transitive permutation group. The background is that there are so many fpf elements (at least a … Continue reading
Pretty structures
I was at the Pretty Structures conference in Paris last week. The original conference in what became this sequence was called Pretty Things. Perhaps this is not serious enough for a meeting held at the Institut Henri Poincaré, I don’t … Continue reading
Posted in events, exposition
Tagged Condorcet paradox, derangements, Jack Edmonds, Kathie Cameron, Lehman matrix, Nash equilibrium, synchronization
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