Ronan Quarez: On the real zeros of positive semi-definite biquadratic forms
Datum objave: 25. 11. 2010
Seminar za funkcionalno analizo in algebro
We recall some old constructions of positive semi-definite biquadratic
forms which are not sums of squares and we give some new families of
examples. We show that if a positive semi-definite biquadratic form F in (3, 3)
variables has a finite number but at least 7 real zeros, then it is not
a sum of squares.
VABILO
Seminar za funkcionalno analizo in algebro bo nadaljeval z delom po naslednjem razporedu:
2. 12. 2010 (Ljubljana, FMF, Plemljev seminar ob 14.15):
Ronan Quarez (Rennes, Francija): On the real zeros of positive semi-definite biquadratic forms.
Vljudno vabljeni!
Matej Brešar in Peter Šemrl
