13 mar 2019 -- 12:00
Aula Tricerri, DiMaI, Firenze
Abstract.
We establish a new extremal property of the classical Chebyshev polynomials in the context of the theory of rank-one approximations of tensors. We also give some necessary conditions for a tensor to be a minimizer of the ratio of spectral and Frobenius norms. This is a joint work with Andrei Agrachev and Andre' Uschmajew.