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Surgery on manifolds: the early days
Surgery on manifolds: the early days … Seminar series Topology Seminar … 1960 to introduce a construction for killing homotopy groups of manifolds. When this was generalised to killing …
Ulrike Tillmann. - 03 Apr 2022
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Simple homotopy types of 4-manifolds
… Seminar series Topology Seminar … higher even dimensions. The examples are constructed using surgery theory and the s-cobordism theorem, and are … including progress on classifying the possible fundamental groups for which examples exist. This is joint work with …
Helen McGregor. - 10 Oct 2022
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Oxford Topology
Oxford Topology … London Geometry and Topology Seminar Geometry and Groups in the South East Video [ … and new Finiteness properties of discrete groups Surgery theory Arc-presentations of links The …
Christopher Douglas. - 13 Dec 2023
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From Sturm, Sylvester, Witt and Wall to the present day
… survey with Etienne Ghys "Signatures in algebra, topology and dynamics" … number fields motivated Witt to introduce the "Witt groups" of stable isomorphism classes of quadratic forms … in the context of the speaker's algebraic theory of surgery. …