List questions from c-star-algebras

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63

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Is an exact-by-nuclear extension of $C^*$-algebras again exact?

Published on 31 Mar 2026 - 19:49

43

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Faithful state and associated measure.

Published on 10 Feb 2021 - 16:06

49

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In a $C^*$ algebra why $\|a\|\not =\rho(a)$ for any $a$?

Published on 10 Feb 2021 - 21:33

80

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Support Projection for Characters in $\mathrm{C}^*$-Algebra with finitely many characters

Published on 30 Mar 2026 - 3:37

192

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Dixmier's explanation of why $L^1(G)$ is not a $C^*$-algebra

Published on 11 Feb 2021 - 0:12

430

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Sum of two positive elements is positive in a $C^*$ algebra is positive

Published on 13 Feb 2021 - 2:13

153

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Pure states on noncommutative $\mathrm{C}^*$-algebra can "be disturbed"

Published on 30 Mar 2026 - 3:37

99

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Factor a rank one operator on a Hilbert C*-module.

Published on 09 Apr 2026 - 11:56

47

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Equivalence of the two definitions of multiplier algebra.

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68

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State on *-algebra: $\phi(|f+g|^2)$ when $\phi(|f|^2),\phi(|g|^2)>0$ for monomials

Published on 30 Mar 2026 - 3:37

94

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Functional calculus - Typo in Blackadar's Operator Algebras?

Published on 09 Apr 2026 - 8:20

124

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Faithful semi-finite normal weights

Published on 31 Mar 2026 - 5:02

102

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functional calculus on C*-algebra and majoration of $||f(A+B)-f(A)||$

Published on 10 Apr 2026 - 19:22

137

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multiplier algebra and intersection

Published on 09 Apr 2026 - 8:19

List Question

Special case of Elliott's Theorem

Is an exact-by-nuclear extension of $C^*$-algebras again exact?

Faithful state and associated measure.

In a $C^*$ algebra why $\|a\|\not =\rho(a)$ for any $a$?

Support Projection for Characters in $\mathrm{C}^*$-Algebra with finitely many characters

Dixmier's explanation of why $L^1(G)$ is not a $C^*$-algebra

Sum of two positive elements is positive in a $C^*$ algebra is positive

Pure states on noncommutative $\mathrm{C}^*$-algebra can "be disturbed"

Factor a rank one operator on a Hilbert C*-module.

Equivalence of the two definitions of multiplier algebra.

State on *-algebra: $\phi(|f+g|^2)$ when $\phi(|f|^2),\phi(|g|^2)>0$ for monomials

Functional calculus - Typo in Blackadar's Operator Algebras?

Faithful semi-finite normal weights

functional calculus on C*-algebra and majoration of $||f(A+B)-f(A)||$

multiplier algebra and intersection

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