User John

6 votes

2 answers

236 views

inequality for positive contraction operator

asked Apr 26, 2020 at 7:10

4 votes

1 answer

129 views

spectrum of two operators on Banach space

asked Oct 1, 2020 at 9:19

3 votes

2 answers

229 views

Strictly positive element in unital $C^*$ algebra is invertible

asked Nov 28, 2020 at 12:37

3 votes

0 answers

48 views

Existence of a subsequence of a sequence which does not converge a.e.

asked Oct 9, 2022 at 22:00

2 votes

1 answer

191 views

noncommutative Hölder inequality

asked May 6, 2021 at 3:38

2 votes

1 answer

127 views

Borel functional calculus on reduced von Neumann algebra

asked May 19, 2021 at 5:19

2 votes

0 answers

59 views

Line integral with Green's theorem

asked Jul 6, 2019 at 8:09

1 vote

0 answers

64 views

seminorm with $\sigma$-additivity is continuous

asked Sep 8, 2019 at 16:42

1 vote

1 answer

791 views

if the spectrum of a normal element is in unit circle, it's a unitary element

asked Oct 17, 2020 at 7:13

1 vote

1 answer

53 views

unit of closure of involution subalgebra

asked Mar 22, 2021 at 4:42

1 vote

1 answer

45 views

representation from a ideal to $B(H)$

asked Apr 4, 2021 at 14:44

1 vote

1 answer

158 views

Proof of Kaplansky density theorem

asked Apr 22, 2021 at 8:21

1 vote

0 answers

26 views

The (n-1)-dimensional sphere of the product of a unital ring

asked Jul 19 at 6:58

1 vote

1 answer

782 views

Relation between kernel and range

asked Jul 6, 2019 at 6:50

0 votes

1 answer

179 views

the weak-weak continuous mapping is the conjugate operator of a bounded mapping?

asked Apr 19, 2020 at 11:54

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15 Questions

inequality for positive contraction operator

spectrum of two operators on Banach space

Strictly positive element in unital $C^*$ algebra is invertible

Existence of a subsequence of a sequence which does not converge a.e.

noncommutative Hölder inequality

Borel functional calculus on reduced von Neumann algebra

Line integral with Green's theorem

seminorm with $\sigma$-additivity is continuous

if the spectrum of a normal element is in unit circle, it's a unitary element

unit of closure of involution subalgebra

representation from a ideal to $B(H)$

Proof of Kaplansky density theorem

The (n-1)-dimensional sphere of the product of a unital ring

Relation between kernel and range

the weak-weak continuous mapping is the conjugate operator of a bounded mapping?