From Formal to Actual Fibrations

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• Moritz Meisel (Augsburg)
• Friday 15 February 2019, 16:00-17:00
• MR13.

If you have a question about this talk, please contact Nils Prigge.

In this talk I will sketch a geometrically flavoured proof of the Madsen-Weiss theorem based on work by Eliashberg-Galatius-Mishachev. In order to prove the triviality of appropriate relative bordism groups, in a first step a variant of the wrinkling theorem shows that one can reduce to consider fold maps (with additional structure). In a subsequent step a geometric version of the Harer stability theorem is used to get rid of the folds via surgery. I will focus on this second step.

This talk is part of the Junior Geometry Seminar series.

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