List questions from banach-algebras

Published on 23 Feb 2026 - 11:15

375

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Maximal ideals of $C^1[0,1]$

Published on 24 Aug 2020 - 1:03

336

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Topological zero divisors of $\mathbb C^n$

Published on 29 Aug 2020 - 1:50

116

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Multiplicative Limits in Banach Algebra

Published on 30 Aug 2020 - 9:48

163

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Is an invertible element in a Banach algebra always within a certain neighborhood of another invertible element?

Published on 04 Sep 2020 - 16:44

162

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Unitary operator as cayley transform of self adjoint

Published on 12 Sep 2020 - 19:16

125

Views

Proof that $C_0(X)$ is closed under addition and multiplication

Published on 18 Sep 2020 - 18:50

59

Views

Banach algebra 's homomorphic functional

Published on 26 Sep 2020 - 11:40

149

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banach algebra and modular left ideal

Published on 29 Sep 2020 - 2:13

139

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Closure of Laurent polynomials is convergent Laurent series?

Published on 05 Oct 2020 - 14:25

56

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Proving that $\|f*g\|_1\leq\|f\|_1\|g\|_1$ for all $f,g\in\ell^1(\mathbb{Z})$?

Published on 06 Oct 2020 - 19:06

300

Views

compact subset of $\mathbb{C}$ is spectrum. (Banach space / hilbert space)

Published on 08 Oct 2020 - 2:56

53

Views

If $\ell^1(S)$ is unital, must the semigroup $S$ have an identity?

Published on 10 Oct 2020 - 20:56

94

Views

Unitisation of an algebra: Is the norm $\text{max}\lbrace\|a\|_A,|\lambda|\rbrace$ submultiplicative?

Published on 27 Mar 2026 - 0:03

396

Views

Under what conditions is a norm on an algebra equivalent to a submultiplicative norm?

Published on 27 Mar 2026 - 0:06

List Question

Commutative monoid structures on $\Bbb{N}$

Maximal ideals of $C^1[0,1]$

Topological zero divisors of $\mathbb C^n$

Multiplicative Limits in Banach Algebra

Is an invertible element in a Banach algebra always within a certain neighborhood of another invertible element?

Unitary operator as cayley transform of self adjoint

Proof that $C_0(X)$ is closed under addition and multiplication

Banach algebra 's homomorphic functional

banach algebra and modular left ideal

Closure of Laurent polynomials is convergent Laurent series?

Proving that $\|f*g\|_1\leq\|f\|_1\|g\|_1$ for all $f,g\in\ell^1(\mathbb{Z})$?

compact subset of $\mathbb{C}$ is spectrum. (Banach space / hilbert space)

If $\ell^1(S)$ is unital, must the semigroup $S$ have an identity?

Unitisation of an algebra: Is the norm $\text{max}\lbrace\|a\|_A,|\lambda|\rbrace$ submultiplicative?

Under what conditions is a norm on an algebra equivalent to a submultiplicative norm?

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