List questions from banach-algebras

Published on 27 Jan 2014 - 15:05

154

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Continuity of additive maps

Published on 29 Jan 2014 - 9:59

64

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Does there exists $f\in A(\mathbb T)$ such that $||f||=r$ and $||\mathrm{e}^{if}||= \mathrm{e}^{r}$?

Published on 29 Jan 2014 - 17:12

659

Views

How to interpret Fourier-Stieltjes transform on $\mathbb T$ (one dimesional torus)?

Published on 30 Jan 2014 - 14:00

342

Views

How to prove $\widehat{(fg)}(n) = \hat{f} (n) \ast \hat{g} (n); (n \in \mathbb Z)$?

Published on 04 Feb 2014 - 14:27

89

Views

Gelfand Transform in a specific case

Published on 11 Feb 2014 - 21:18

84

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Is taking limits in this proof really necessary?

Published on 14 Feb 2014 - 9:30

137

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Are these two steps in this proof necessary?

Published on 15 Feb 2014 - 17:07

77

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homomorphism or not

Published on 16 Feb 2014 - 22:50

1k

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A closed ideal in a commutative Banach algebra $C(X)$

Published on 17 Feb 2014 - 14:38

316

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boundary of a spectrum proof

Published on 17 Feb 2014 - 18:34

164

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SOT Convergence and Compact Convergence

Published on 21 Feb 2014 - 3:21

235

Views

Find an example of product of operators not Jointly Continuous in strong topology.

Published on 23 Feb 2014 - 19:06

218

Views

On the spectral radius $r(ab) $

Published on 24 Feb 2014 - 15:34

34

Views

Set difference of spectra

Published on 24 Feb 2014 - 20:04

List Question

How to inter change of norm and limit in the Banach algebra?

Continuity of additive maps

Does there exists $f\in A(\mathbb T)$ such that $||f||=r$ and $||\mathrm{e}^{if}||= \mathrm{e}^{r}$?

How to interpret Fourier-Stieltjes transform on $\mathbb T$ (one dimesional torus)?

How to prove $\widehat{(fg)}(n) = \hat{f} (n) \ast \hat{g} (n); (n \in \mathbb Z)$?

Gelfand Transform in a specific case

Is taking limits in this proof really necessary?

Are these two steps in this proof necessary?

homomorphism or not

A closed ideal in a commutative Banach algebra $C(X)$

boundary of a spectrum proof

SOT Convergence and Compact Convergence

Find an example of product of operators not Jointly Continuous in strong topology.

On the spectral radius $r(ab) $

Set difference of spectra

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