List questions from banach-algebras

Published on 21 Oct 2016 - 12:25

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convergence of approximate unit

Published on 21 Oct 2016 - 17:03

203

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Holomorphic functional calculus: a fixed point

Published on 23 Feb 2026 - 13:40

102

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Banach algebra: for $\lambda$ not in the spectrum of $a$, $\Vert (\lambda - a)^{-1} \Vert \ge 1/\text{dist}(\lambda, \sigma(a))$

Published on 22 Oct 2016 - 13:10

94

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On the projective tensor product of Banach algebras

Published on 02 Nov 2016 - 7:40

236

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Banach Subalgebras: Spectrum

Published on 08 Nov 2016 - 11:57

296

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the Banach algebra, invertible element

Published on 12 Nov 2016 - 17:47

24

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Minimal rank of a real algebra

Published on 13 Nov 2016 - 7:09

411

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Example of a Banach Algebra where $\sigma(xy) \neq \sigma(yx)$

Published on 17 Nov 2016 - 18:43

80

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Is it necessary to have $A$ unital in this exercise?

Published on 26 Nov 2016 - 5:14

433

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$ab$ and $ba$ invertible elements imply $a$ and $b$ invertible in a Banach algebra

Published on 02 Dec 2016 - 10:32

209

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Maximal ideals of abelian Banach algebras

Published on 02 Dec 2016 - 12:25

210

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Must a Banach algebra be unital and commutative in order to have characters?

Published on 02 Dec 2016 - 12:45

54

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Derivation and character space

Published on 05 Dec 2016 - 13:34

510

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Are the invertible elements dense in a finite dimensional Banach Algebra?

Published on 13 Dec 2016 - 6:48

List Question

Weakly amenable Banach algebras

convergence of approximate unit

Holomorphic functional calculus: a fixed point

Banach algebra: for $\lambda$ not in the spectrum of $a$, $\Vert (\lambda - a)^{-1} \Vert \ge 1/\text{dist}(\lambda, \sigma(a))$

On the projective tensor product of Banach algebras

Banach Subalgebras: Spectrum

the Banach algebra, invertible element

Minimal rank of a real algebra

Example of a Banach Algebra where $\sigma(xy) \neq \sigma(yx)$

Is it necessary to have $A$ unital in this exercise?

$ab$ and $ba$ invertible elements imply $a$ and $b$ invertible in a Banach algebra

Maximal ideals of abelian Banach algebras

Must a Banach algebra be unital and commutative in order to have characters?

Derivation and character space

Are the invertible elements dense in a finite dimensional Banach Algebra?

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