For more information about this event, visit our website.…
Categoria evento: Baby Geometri Seminar
The dependence of the psc space of a manifold from its normal 2-type – Agnese Mantione (University of Münster)
Gromov and Lawson’s surgery theorem states that positive scalar curvature (psc) is invariant under surgeries of codimension at least 3.…
Subgroups generated by Dehn twists – Livio Ferretti (University of Bern)
For more information about this event, visit our website.…
An introduction to higher rank Teichmüller theory – Andrea Tamburelli (University of Pisa)
For more information about this event, visit our website.…
An introduction to Khovanov homology – Laura Marino (Institut de Mathématiques de Jussieu)
Introduced around 2000, Khovanov homology marked the start of a new field of study in knot theory. It was born as a “categorification” (or generalisation) of the Jones polynomial, a classical link invariant, but it proved to be more than just that…
The homology cobordism group – Oğuz Şavk (Stanford University / Boğaziçi University)
Since the 1980s, the homology cobordism group has been a
central object in the development of low-dimensional topology. …
The geometry of the Word Problem – Jeronimo Garcia Mejia (KIT Karlsruher Institut für Technologie)
We will review a classical problem in group theory, the so-called Word Problem, from a geometric perspective by relating it to an even older geometric problem, the Isoperimetric Problem. The main actor being Dehn functions. …
Free groups and Stallings’ folding – Dario Ascari (Oxford University)
L’operazione di folding sui grafi, introdotta da Stallings, è uno strumento fondamentale nello studio di varie proprietà dei gruppi liberi.…
Slice knots: knot theory in dimension 4 – Paula Truöl (ETH Zürich)
Knot theory is a subarea of low-dimensional topology – the study of smooth manifolds of dimension 4 or less. Classical knots are smooth embeddings of the (oriented) circle S^1 into R^3 (or into the 3-sphere), usually studied up to an equivalence relation called ambient isotopy.…
Amenable open covers of aspherical spaces – Kevin Li (University of Southampton, UK)
Amenable groups are small from a large scale geometric point of view. If a space can be covered by few subsets with amenable fundamental group, there are strong vanishing results for several invariants…