Connes-Kreimer II (BPHZ und die Renormierungsgruppe)
Dienstag, 9.6.09, 11:15-12:15, Raum 403, Eckerstr. 1
Freitag, 12.6.09, 11:15-12:15, Raum 404, Eckerstr. 1
Riemann-Hilbert-Korrespondenzen I
Dienstag, 16.6.09, 11:15-12:15, Raum 403, Eckerstr. 1
Maps of Toric Varieties in Cox Coordinates
Mittwoch, 17.6.09, 11:00-12:00, Raum 414, Eckerstr. 1
The Cox ring provides a very useful coordinate system on a toric variety, by analogy with the homogeneous coordinate ring of projective space. Rational maps between projective spaces are described by a sequence of polynomials in a coordinate ring. We generalise this to toric varieties, providing a unified description of arbitrary maps between toric varieties in terms of their Cox coordinates. Introducing roots of polynomials is necessary even in the simplest examples.
Riemann-Hilbert-Korrespondenzen II
Dienstag, 23.6.09, 11:15-12:15, Raum 403, Eckerstr. 1
Rational curves of minimal degree on higher Fano manifolds
Freitag, 26.6.09, 11:15-12:15, Raum 403, Eckerstr. 1
We will discuss a notion of higher Fano variety introduced by\nde Jong/Starr. We will especially study what one can say about the families of minimal degree rational curves that sweep out such a higher Fano variety.\nRelated questions: Can one classify higher Fanos? Is there an inductive structure on the collection of all higher Fano varieties?
Riemann-Hilbert-Korrespondenzen III
Dienstag, 30.6.09, 11:15-12:15, Raum 403, Eckerstr. 1