Il seminario di geometria di questa settimana si terrà domani Martedì 23 Aprile alle 14.30 in Aula Riunioni. Isaac Sundberg (MPIM Bonn) parlerà di "Khovanov homology and surfaces in the 4-ball". Di seguito l'abstract.

It is difficult to detect differences between topological and smooth phenomena, so it was surprising when Rasmussen used a purely combinatorial theory, known as Khovanov homology, to obstruct the smooth sliceness of topologically slice knots. In this talk, we discuss another application of this homology theory: obstructing smooth isotopy of topologically isotopic surfaces in the 4-ball. We highlight recent results and give an idea of the construction for this obstruction.

Le informazioni sui prossimi seminari si trovano sul sito.