List questions from operator-algebras

Published on 01 Jun 2012 - 4:30

505

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Does the inequality $0\leq a\leq b$ in a C*-algebra imply $\|a\|\leq\|b\|$?

Published on 02 Jun 2012 - 20:09

496

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What are operators, commutators and anti commutators algebra?

Published on 07 Jun 2012 - 19:40

112

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what is mathematical difference between an hermitian operator $\hat A$ and a vector $\vec A$?

Published on 08 Jun 2012 - 18:39

642

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The commutant of a tensor product

Published on 09 Jun 2012 - 19:28

627

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Subprojection of a finite projection

Published on 10 Jun 2012 - 0:41

609

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An upper bound for $\|(\lambda-A)^{-1}\|$?

Published on 15 Jun 2012 - 20:10

171

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Ultraweak continuity of power maps on $W^*$-algebras

Published on 30 Mar 2026 - 7:40

509

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Lower bound for $\|A-B\|$ when $\operatorname{rank}(A)\neq \operatorname{rank}(B)$, both $A$ and $B$ are idempotent

Published on 20 Jun 2012 - 15:39

253

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Entirely "Bare-hands" proof that completely additive states are ultraweakly continuous

Published on 30 Mar 2026 - 7:39

343

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Convergence of net sums of complex numbers, as well as operators

Published on 22 Jun 2012 - 7:47

124

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is there any * homomorphism $T$ from $A$ to $B$ ......?

Published on 25 Jun 2012 - 9:30

109

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An explicit example of an invariant halfspace of the unilateral shift?

Published on 25 Jun 2012 - 23:30

495

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Strong convergence of projections in $B(H)$

Published on 30 Mar 2026 - 7:40

1.9k

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Non-$C^{*}$ Banach algebras?

Published on 31 Mar 2026 - 15:06

List Question

Kaplansky's density theorem proof

Does the inequality $0\leq a\leq b$ in a C*-algebra imply $\|a\|\leq\|b\|$?

What are operators, commutators and anti commutators algebra?

what is mathematical difference between an hermitian operator $\hat A$ and a vector $\vec A$?

The commutant of a tensor product

Subprojection of a finite projection

An upper bound for $\|(\lambda-A)^{-1}\|$?

Ultraweak continuity of power maps on $W^*$-algebras

Lower bound for $\|A-B\|$ when $\operatorname{rank}(A)\neq \operatorname{rank}(B)$, both $A$ and $B$ are idempotent

Entirely "Bare-hands" proof that completely additive states are ultraweakly continuous

Convergence of net sums of complex numbers, as well as operators

is there any * homomorphism $T$ from $A$ to $B$ ......?

An explicit example of an invariant halfspace of the unilateral shift?

Strong convergence of projections in $B(H)$

Non-$C^{*}$ Banach algebras?

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