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LiT IV Landing in Topology

12–15 Oct 2026
Palazzo del Castelletto
Europe/Rome timezone

CRM SECRETARY

Contribution List

15 out of 15 displayed
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  1. 23. TBA
    Giovanni Italiano (University of Oxford)
    12/10/2026, 09:30
  2. 22. Small cancellation theories and what they are good for
    Macarena Arenas (ICMAT)
    12/10/2026, 11:00
  3. 29. Arithmetic locally symmetric spaces and geodesic immersions
    Leone Slavich (Università di Genova)
    12/10/2026, 14:30

    We address the problem of classifying commensurability classes of totally geodesic immersion between finite volume, arithmetic, locally symmetric spaces and show how these correspond to morphism between algebraic groups defined over the rationals. We'll also show how the relation between the arithmetic invariants of the spaces encodes information about the geometric properties of the...

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  4. 21. Finiteness properties of automorphism groups
    Naomi Andrew (Laboratoire de Mathématiques d’Orsay)
    12/10/2026, 15:30

    Groups encode symmetries, and their automorphism groups encode the symmetries of the group themselves. So we can ask when "nice" properties of a group imply "nice" properties of its automorphisms. On the positive side, mapping class groups, GL(n,Z) and Out(F_n) are all finitely presented (in fact a stronger property: Type VF), and this can be analysed geometrically, using spaces built from...

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  5. 27. TBA
    Alice Merz (HUN-REN Rényi Alfréd Matematikai Kutatóintézet)
    12/10/2026, 17:00
  6. 35. Small cancellation theories and what they are good for (part II)
    Macarena Arenas (ICMAT)
    13/10/2026, 09:30
  7. 33. TBA (part II)
    Giovanni Italiano (University of Oxford)
    13/10/2026, 11:00
  8. 34. TBA (part III)
    Giovanni Italiano (University of Oxford)
    14/10/2026, 09:30
  9. 36. Small cancellation theories and what they are good for (part III)
    Macarena Arenas (ICMAT)
    14/10/2026, 11:00
  10. 24. Almost planar finitely presented groups
    Joseph MacManus (University of Bristol)
    14/10/2026, 14:30

    Following Benjamini-Schramm, a graph is called 'almost planar' if it can be drawn in the plane such that every edge crosses at most a bounded number of edges, and a finitely generated group is called an 'almost planar group' if its Cayley graphs are almost planar graphs. Despite being a relatively well-studied class, the only known examples of such groups are those which virtually admit a...

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  11. 25. Bounded cohomology, the Hausdorff property, and ultraproducts
    Alexis Marchand (Instytut Matematyczny Polskiej Akademii Nauk)
    14/10/2026, 15:30

    (Joint work with Piotr Nowak.) Bounded cohomology is a functional-analytic variant of group cohomology. Despite its many connections with geometry and topology, it can be a mysterious object. This talk will be about the property of bounded cohomology being Hausdorff. We will explain how this property can be read in asymptotic cohomology, yet another cohomology theory that was introduced...

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  12. 31. Contact Surgery Numbers and Contact Surgery Distance
    Monika Monika (Uniwersytet Warszawski)
    14/10/2026, 17:00

    A celebrated theorem of Ding and Geiges states that every connected, oriented, closed 3-manifold equipped with a cooriented contact structure can be obtained by contact surgery along a Legendrian link in the standard tight contact 3-sphere. This naturally leads to complexity measures for contact 3-manifolds: the contact surgery number and the contact surgery distance. The contact surgery...

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  13. 32. Simultaneous Conjugacy In Thompson's Group V
    Luna Elliott (University of Manchester)
    15/10/2026, 09:30

    Thompson’s group $ V $ was the first known finitely presented infinite simple group. The ordinary conjugacy problem in $ V $ was first solved by Higman and later given a uniform combinatorial treatment, via reduced closed abstract strand diagrams, by Belk–Matucci. The simultaneous (or $ k $-simultaneous) conjugacy problem asks whether, given two $ k $-tuples $ (g_1,\dots,g_k) $ and $...

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  14. 30. Linear volume bounds for drilling and filling
    Gabriele Viaggi (Università di Pisa)
    15/10/2026, 11:00

    There are two important operations that one can perform on a finite volume hyperbolic 3-manifold. One can drill out a simple closed geodesic and one can Dehn fill a cusp. It is a well-known phenomenon that all drillings and most fillings give back a hyperbolizable 3-manifold whose volume is larger for the first operation and smaller for the second. How can we bound the volume change in terms...

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  15. 26. Complete classification of the Dehn functions of Bestvina–Brady groups
    Jeronimo Garcia Mejia (University of Warwick)
    15/10/2026, 12:00

    Introduced by Bestvina and Brady in 1997, Bestvina–Brady groups form an important class of examples in geometric group theory and topology, known for having unusual finiteness properties. In this talk, I will focus on the Dehn functions of finitely presented Bestvina–Brady groups. The Dehn function of a group is a fundamental quasi-isometry invariant that, very roughly speaking, measures how...

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