- #1
DavideGenoa
- 155
- 5
I find, in Kolmogorov-Fomin's Элементы теории функций и функционального анализа, at the end of § 5 of chapter IV, several statement on the spectral radius and the non-emptyness of the spectrum of a linear operator ina Banach space, which are left without proof.
Nevertheless, in Tikhomirov's appendix, the same properties are prooven for non-commutative unitary Banach algebras.
I wonder whether all Banach spaces can be provided with the structure of a unitary (not necessarily commutative) Banach algebras...
##\infty## thanks!
Nevertheless, in Tikhomirov's appendix, the same properties are prooven for non-commutative unitary Banach algebras.
I wonder whether all Banach spaces can be provided with the structure of a unitary (not necessarily commutative) Banach algebras...
##\infty## thanks!