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Sul teorema di Gelfand-Mazur

Nicola Rodino (1982)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

In this note we produce a complex algebra without characters and which does not contain a proper extension of the complex number field.

Symmetric Banach *-algebras: invariance of spectrum

Bruce Barnes (2000)

Studia Mathematica

Let A be a Banach *-algebra which is a subalgebra of a Banach algebra B. In this paper, assuming that A is symmetric, various conditions are given which imply that A is inverse closed in B.

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