buondì,
scusandomi del ritardo, vi annuncio il seminario di oggi di geometria.
Come sempre, alle 14.30 in aula seminari.
MERCOLEDI' 19 GIUGNO 2013
SEMINARI DI GEOMETRIA
14:30-15:30, Sala Seminari (Dip. Matematica)
Rational Blancheld forms, S-equivalence, and null LP-surgeries
Délphine Moussard (Università di Pisa)
Abstract:
A QSK-pair is a pair (M,K) made of a rational homology sphere M and a
null-homologous knot K in M. We will introduce a move on the set of
QSK- pairs called null Lagrangian-preserving surgery. In order to
study finite type invariants of QSK-pairs, it is interesting to
describe the classes of QSK-pairs up to null Lagrangian-preserving
surgeries. We will state that these classes are caracterised by the
Alexander module of the QSK-pairs equipped with its Blanchfield form,
and we will give the main ideas of the proof.
