Carə tuttə,
Vi invitiamo al seminario dei Baby Geometri della prossima settimana:
Martedì 03 Dicembre 2024, alle ore 11:30
Presso l’Aula Mancini del Palazzo della Carovana
Gaëtan Simian (Université de Genève)
terrà un seminario dal titolo:
The Arf invariant of colored links
di cui riportiamo l'abstract:
The Arf invariant is a modulo 2 integer associated to a non-singular quadratic form over the field F2. In 1965, Robertello applied this theory to Seifert forms, leading to an invariant of a certain class of oriented links. Colored links are a
natural generalisation of oriented links, where the components are grouped into sublinks. Several invariants of oriented links, such as the Alexander module and the Levine-Tristram signature, admit natural multivariable extensions to colored links via so-called
"generalised Seifert surfaces". In this talk, I will define these notions and briefly explain how to use generalised Seifert surfaces to extend the Arf-Robertello invariant to colored links. Unfortunately, these extensions turn out to be determined by the
linking numbers.
Tutte le persone interessate sono invitate a partecipare.
A presto,
Elena Bogliolo
Pietro Capovilla
Alessio Di Prisa
Giovanni Framba
Ervin Hadžiosmanović