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  1. 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

  2. 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

  3. 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

  4. 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.   …

    . - 04 Apr 2022