List questions from banach-algebras

Published on 30 Oct 2021 - 7:36

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Must a Banach algebra be unital in order to have a nonempty character space?

Published on 04 Nov 2021 - 22:04

251

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Examples of Banach $^$-algebras where $^$ is not an isometry

Published on 25 Mar 2026 - 23:38

81

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Definition of virtual diagonals

Published on 23 Feb 2026 - 11:33

166

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Question on non-unital finite dimensional Banach algebras.

Published on 15 Nov 2021 - 7:53

55

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Question related to Banach algebra

Published on 21 Nov 2021 - 21:33

121

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Is C(K) a subalgebra in its bidual?

Published on 27 Mar 2026 - 19:32

340

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Dual space of $\mathcal{C}^n [a,b]$.

Published on 30 Mar 2026 - 8:37

73

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For a Banach algebra, the induced power series of the inverse is the inverse of the induced power series

Published on 30 Nov 2021 - 18:04

683

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Pure states on commutative C* algebra are exactly the characters - elementary proof

Published on 02 Dec 2021 - 12:59

375

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Proving that if $C_0(X)$ is unital, then $X$ is compact

Published on 09 Dec 2021 - 0:40

137

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Spectrum $\sigma(a)$ taken within the unitisation of a $C^*$-algebra

Published on 14 Dec 2021 - 14:11

167

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ideals, projections and factors in VN algebras

Published on 31 Mar 2026 - 17:53

52

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If $\Phi$ is injective, $X_1$ normal and Hausdorff and $X_2$ compact, then $F$ is surjective

Published on 02 Jan 2022 - 14:59

244

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Understanding Riesz's functional calculus

Published on 24 Feb 2026 - 11:52

List Question

exponential of non-commuting matrices

Must a Banach algebra be unital in order to have a nonempty character space?

Examples of Banach $^$-algebras where $^$ is not an isometry

Definition of virtual diagonals

Question on non-unital finite dimensional Banach algebras.

Question related to Banach algebra

Is C(K) a subalgebra in its bidual?

Dual space of $\mathcal{C}^n [a,b]$.

For a Banach algebra, the induced power series of the inverse is the inverse of the induced power series

Pure states on commutative C* algebra are exactly the characters - elementary proof

Proving that if $C_0(X)$ is unital, then $X$ is compact

Spectrum $\sigma(a)$ taken within the unitisation of a $C^*$-algebra

ideals, projections and factors in VN algebras

If $\Phi$ is injective, $X_1$ normal and Hausdorff and $X_2$ compact, then $F$ is surjective

Understanding Riesz's functional calculus

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