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University of Cambridge > Talks.cam > Isaac Newton Institute Seminar Series > Chromatic congruences and Bernoulli numbers

## Chromatic congruences and Bernoulli numbersAdd to your list(s) Download to your calendar using vCal - Irakli Patchkoria (University of Aberdeen)
- Monday 17 June 2024, 11:15-12:15
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If you have a question about this talk, please contact nobody. TRHW02 - International Conference For every n and a fixed prime p, we construct a new congruence for the orbifold Euler characteristic of a group which we call the chromatic congruence at the height n. Here the word “chromatic” refers to the chromatic stable homotopy theory, though to understand this talk no background in stable homotopy theory is required. The p-adic limit of these congruences when n tends to infinity recovers the well-known Brown-Quillen congruence. We apply these results to mapping class groups and using Harer-Zagier we get an infinite family of congruences for Bernoulli numbers. At the end we will see that these congruences in particular recover classical congruences for Bernoulli numbers due to Kummer, Voronoi, Carlitz and Cohen. This talk is part of the Isaac Newton Institute Seminar Series series. ## This talk is included in these lists:- All CMS events
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