List questions from c-star-algebras

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What is a support projection in a $C^*$-algebra?

Published on 20 Jun 2015 - 12:30

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positive elements in a $C^*$-algebra

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Projective (or inverse) limit of C*-algebras

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107

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Two normal operator that commutes

Published on 21 Jun 2015 - 7:31

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Orthogonal elements in a unitization of a $C^*$-algebra

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293

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Commutativity criteria for $C^*$-algebras

Published on 22 Jun 2015 - 11:16

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Centralizer of $C^*$ algebra

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unitization of a unital $C^*$-algebra

Published on 23 Jun 2015 - 14:42

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Questions about stable rank of inductive limit of $C^\ast$-algebras

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product $ab$ of postive elements $a,b$ is again positive, if $ab=ba$.

Published on 26 Jun 2015 - 7:41

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does this theorem imply that every $C^*$-algebra has an approximate unit?

Published on 26 Jun 2015 - 13:46

215

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Is the supremum norm the only $ C^{*} $-norm on $ {C_{c}}(X) $, equipped with the usual pointwise operations?

Published on 03 Apr 2026 - 16:51

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If a normal element of a C* algebra has real spectrum, then it is self-adjoint

Published on 03 Apr 2026 - 2:37

82

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Strict positiveness on a C*-algebra given by generators and relations.

Published on 03 Apr 2026 - 16:46

List Question

Two-sided closed ideals of $C(X,M_2(\mathbb C))$

What is a support projection in a $C^*$-algebra?

positive elements in a $C^*$-algebra

Projective (or inverse) limit of C*-algebras

Two normal operator that commutes

Orthogonal elements in a unitization of a $C^*$-algebra

Commutativity criteria for $C^*$-algebras

Centralizer of $C^*$ algebra

unitization of a unital $C^*$-algebra

Questions about stable rank of inductive limit of $C^\ast$-algebras

product $ab$ of postive elements $a,b$ is again positive, if $ab=ba$.

does this theorem imply that every $C^*$-algebra has an approximate unit?

Is the supremum norm the only $ C^{*} $-norm on $ {C_{c}}(X) $, equipped with the usual pointwise operations?

If a normal element of a C* algebra has real spectrum, then it is self-adjoint

Strict positiveness on a C*-algebra given by generators and relations.

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