List questions from banach-algebras

Published on 07 May 2026 - 10:10

65

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When does the spectrum of an element in a Banach algebra with involution lie in the open right half-plane?

Published on 14 Apr 2026 - 15:43

248

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Commutative Banach algebras and maximum ideal space

Published on 15 Apr 2026 - 4:33

236

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Banach Algebra Isomorphism

Published on 09 Apr 2026 - 5:26

190

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Banach algebra $l^p$ is not isomorphic to $C^{*}$ algebra

Published on 09 Apr 2026 - 5:28

25

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$C_0(\Delta(l^p))$ description

Published on 15 Apr 2026 - 2:22

52

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Regarding continuous function not in the Disc algebra

Published on 12 Apr 2026 - 14:30

90

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Verapoulous Algebra $C(K) \mathbin{\hat\otimes} C(L)$ is a subalgebra of $C(K\times L)$?

Published on 14 Apr 2026 - 4:00

122

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An example of a Banach algebra satisfying given conditions

Published on 12 Apr 2026 - 10:00

37

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A natural Banach algebra where adjoint doesn't preserve the norm?

Published on 17 Apr 2026 - 8:47

74

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Bounding || zx - yz || given that || x - y || < M in a Banach algebra.

Published on 16 Apr 2026 - 22:31

46

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In Banach algebra $A$ find an example such hat $e^{a+b} \not =e^ae^b$

Published on 15 Apr 2026 - 0:40

95

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Prove that $|f|_X\leq \|f\|$ for every $f\in C(X)$

Published on 15 Apr 2026 - 9:29

684

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Invertible elements in $l^1(\mathbb Z)$

Published on 15 Apr 2026 - 2:36

143

Views

Prove that $(\ell^2, \left||.\right\|_2)$ is a commutative and semisimple Banach algebra

Published on 16 Apr 2026 - 8:36

List Question

Gelfand map is topologically injective

When does the spectrum of an element in a Banach algebra with involution lie in the open right half-plane?

Commutative Banach algebras and maximum ideal space

Banach Algebra Isomorphism

Banach algebra $l^p$ is not isomorphic to $C^{*}$ algebra

$C_0(\Delta(l^p))$ description

Regarding continuous function not in the Disc algebra

Verapoulous Algebra $C(K) \mathbin{\hat\otimes} C(L)$ is a subalgebra of $C(K\times L)$?

An example of a Banach algebra satisfying given conditions

A natural Banach algebra where adjoint doesn't preserve the norm?

Bounding || zx - yz || given that || x - y || < M in a Banach algebra.

In Banach algebra $A$ find an example such hat $e^{a+b} \not =e^ae^b$

Prove that $|f|_X\leq \|f\|$ for every $f\in C(X)$

Invertible elements in $l^1(\mathbb Z)$

Prove that $(\ell^2, \left||.\right\|_2)$ is a commutative and semisimple Banach algebra

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