Spring 2026
01/26/26: Anthony Conway: Good groups.
01/12/26: Anthony Conway: Good groups.
Fall 2025
12/08/25: Anthony Conway: Wilczynski: On the topological classification of pseudofree group actions on 4-manifolds I.
12/01/25: Anthony Conway: Wilczynski: On the topological classification of pseudofree group actions on 4-manifolds I.
11/17/25: Nathan Louie: Cha-Kim: Lightbulb smoothing for topological surfaces in 4-manifolds (Theorem C).
11/10/25: Audrick Pyronneau: Classifying closed, spin, simply-connected 4-manifolds via the normal 2-type, II
11/03/25: Ansel Goh: Classifying closed, spin, simply-connected 4-manifolds via the normal 2-type, I
10/27/25: Daniel Galvin: On the connectedness of the map Top(4)/O(4) -> Top/O.
10/20/25: Ansel Goh: Hambleton-Kreck: Homotopy self-equivalences of 4-manifolds (Theorem B).
10/13/25: Anthony Conway: Knot concordance and intro to homology surgery.
10/06/25: Anthony Conway. Kwasik: On the symmetries of fake CP2.
09/29/25. Audrick Pyronneau. Boyer: Realisation of 4-manifolds with a given boundary (Theorem F).
09/22/25. Daniel Galvin. On TOP.
09/15/25. Remy Bohm. McCooey: Concordance of Z_pxZ_p actions on S^4.
09/08/25. Anthony Conway. Cha-Kim-Powell: A family of freely slice good boundary links.
08/25/25. Anthony Conway. A short introduction to the surgery conjecture.
Spring 2025
04/21/25. Lisa Piccirillo. Lidman-Piccirillo: Stably irreducible non-orientable knotted surfaces.
04/14/25. Audrick Pyronneau. Kreck: Isotopy classes of diffeomorphisms of (k-1)-connected almost-parallelizable 2k-manifolds.
04/07/25. Daniel Galvin (MPIM). Galvin-Nonino: Pseudo-isotopy versus isotopy for homeomorphisms of 4-manifolds.
03/31/25. John Teague. Kasprowski-Land-Powell-Teichner: Stable classification of 4-manifolds with 3-manifold fundamental groups.
03/24/25. Anthony Conway. Recap of classical and modified surgery; application to closed, spin, simply-connected 4-manifolds,
03/10/25. Jemma Schroder. Kasprowski-Land-Powell-Teichner: Stable classification of 4-manifolds with 3-manifold fundamental groups.
02/24/25. Anthony Conway. Orson-Powell: Simple spines of homotopy 2-spheres are unique.
02/17/25. Audrick Pyronneau. Orson-Powell: Simple spines of homotopy 2-spheres are unique.
02/10/25. Ansel Goh. On Whitehead torsion.
02/03/25. Anthony Conway. Intro to modified surgery theory, i.e. Kreck: Surgery and duality.
01/27/25. Anthony Conway. Davis-Hillman: Aspherical 4-manifolds with elementary amenable fundamental group.
Fall 2024
12/09/24: Anthony Conway. Hillman: Homotopy types of 4-manifolds with 3-manifold fundamental groups.
12/01/24: Mark Pencovitch. Feller-Miller-Nagel-Orson-Powell-Ray: Embedding spheres in knot traces.
11/18/24. Anthony Conway. Intro to surgery theory + Friedl-Teichner: New topologically slice knots.
11/ 13/24. Mark Powell (U. Glasgow). The 31-authored paper: Algorithms in 4-manifold topology.
11/04/24. Audrick Pyronneau. Kasprowski-Powell-Ray: Gluck twists on concordant or homotopic spheres.
10/28/24. Daniel Kasprowski (U. Southampton). Kasprowski-Teichner: CP2 -stable classification of 4 -manifolds with finite fundamental group.
10/21/24. Mark Pencovitch. Orson-Powell: Mapping class groups of simply connected 4-manifolds with boundary.
10/14/24. Anthony Conway. Boyer: Simply-connected 4-manifolds with a given boundary + Realisation of 4-manifolds with a given boundary.