Displaying similar documents to “A generalization of Gelfand-Mazur theorem.”

Bundles of Banach algebras.

Kitchen, J.W., Robbins, D.A. (1994)

International Journal of Mathematics and Mathematical Sciences

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Non-normal elements in Banach *-algebras

B. Yood (2004)

Studia Mathematica

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Let A be a Banach *-algebra with an identity, continuous involution, center Z and set of self-adjoint elements Σ. Let h ∈ Σ. The set of v ∈ Σ such that (h + iv)ⁿ is normal for no positive integer n is dense in Σ if and only if h ∉ Z. The case where A has no identity is also treated.