List questions from banach-algebras

Published on 12 Jul 2011 - 22:08

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Abelian sub-C*-algebras

Published on 21 Jul 2011 - 23:09

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The identity cannot be a commutator in a Banach algebra?

Published on 29 Jul 2011 - 4:22

1.8k

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Reference request: Fourier and Fourier-Stieltjes algebras

Published on 27 Mar 2026 - 0:58

518

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How to prove Halmos’s Inequality

Published on 14 Aug 2011 - 15:58

337

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When is the ring of continuous functions absolutely flat?

Published on 28 Aug 2011 - 1:36

163

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Do non-commutative algebras with dense commutative subalgebras exist?

Published on 14 Oct 2011 - 22:38

3.5k

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Prove that $\sigma(AB) \backslash \{0\} = \sigma(BA)\backslash \{0\} $

Published on 05 Nov 2011 - 15:06

674

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Does the Banach algebra $L^1(\mathbb{R})$ have zero divisors?

Published on 11 Dec 2011 - 22:55

2.4k

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Closure of the invertible operators on a Banach space

Published on 16 Dec 2011 - 18:12

988

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Why is $GL(B)$ a Banach Lie Group?

Published on 17 Dec 2011 - 21:33

414

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How far is a Banach algebra from being a multiplicative group?

Published on 22 Dec 2011 - 3:04

811

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a question about invertibility of Banach Algebra

Published on 22 Dec 2011 - 10:22

2.8k

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Why is $\ell^1(\mathbb{Z})$ not a $C^{*}$-algebra?

Published on 30 Dec 2011 - 6:31

596

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Reflexive Banach algebras?

Published on 31 Dec 2011 - 12:25

List Question

Geometric Sums in Banach Algebra

Abelian sub-C*-algebras

The identity cannot be a commutator in a Banach algebra?

Reference request: Fourier and Fourier-Stieltjes algebras

How to prove Halmos’s Inequality

When is the ring of continuous functions absolutely flat?

Do non-commutative algebras with dense commutative subalgebras exist?

Prove that $\sigma(AB) \backslash \{0\} = \sigma(BA)\backslash \{0\} $

Does the Banach algebra $L^1(\mathbb{R})$ have zero divisors?

Closure of the invertible operators on a Banach space

Why is $GL(B)$ a Banach Lie Group?

How far is a Banach algebra from being a multiplicative group?

a question about invertibility of Banach Algebra

Why is $\ell^1(\mathbb{Z})$ not a $C^{*}$-algebra?

Reflexive Banach algebras?

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