ore
14:30
presso Aula Vitali
Binary real forms of degree d admit as typical ranks all the
integers between floor(d/2)+1 and d. We investigate the boundary between
the open subset of rank r forms and the open subset of rank r+1.
These boundaries are known only in the extreme cases, by Lee-Sturmfels
(between rank floor(d/2)+1 and floor(d/2)+2) and Comon-Ottaviani
(between rank d-1 and d). We investigate the intermediate boundaries.
In the talk I will present our new results, focusing on the case of
degree 7 forms. This is work in progress with G.Stagliano'.