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СЕМИНАРЫ |
Семинар по геометрической топологии
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Birman-Craggs and Johnson homomorphisms Б. Усов |
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Аннотация: In this talk I will focus on the Torelli group, a subgroup of the mapping class group of a surface. For a start I will recall the Arf invariant and the Rochlin invariant. After that I will show how to construct a homology 3-sphere from an element of the Torelli group, so as to obtain certain homomorphisms from the Torelli group to |