Sergei Akbarov's user avatar
Sergei Akbarov's user avatar
Sergei Akbarov's user avatar
Sergei Akbarov
  • Member for 12 years, 5 months
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3 votes
1 answer
192 views

Is the preimage of a Hopf subalgebra a Hopf subalgebra?

3 votes
1 answer
330 views

Is there an operation in topology analogous to the operation of averaging over a compact subgroup in harmonic analysis?

5 votes
1 answer
156 views

Is norm-continuous representation factored through a Lie quotient group?

3 votes
0 answers
192 views

Functors, forming pairs "coretraction–retraction", what are they called?

2 votes
1 answer
214 views

Haar measures of compact subgroups

14 votes
4 answers
2k views

What can be preserved in mathematics if all constructions are carried out in ZF?

6 votes
0 answers
172 views

Functions of polynomial growth on linear algebraic groups

2 votes
1 answer
257 views

Qualitative difference between "continuous" and "discontinuous" states on $M(G)$

3 votes
0 answers
150 views

Is it possible to reconstruct the universally measurable sets in X from the $C^*$-algebra $C(X)^{**}$?

3 votes
1 answer
578 views

Completions of $C(X)$ with respect to the topologies generated by states

3 votes
0 answers
216 views

Is it possible to reconstruct the compact space $X$ from the space of measures $M(X)$?

3 votes
1 answer
151 views

$\varepsilon$-product in Bierstedt's paper

3 votes
0 answers
111 views

Approximation of a linear functional by linear continuous functionals

3 votes
0 answers
153 views

What do people call functionals on holomorphic functions and on polynomials?

6 votes
0 answers
845 views

Tannaka without Yoneda?

5 votes
2 answers
565 views

How is the morphism of composition in the enriched category of modules constructed?

4 votes
0 answers
189 views

Approximation of a holomorphic function vanishing at a submanifold by polynomials

6 votes
1 answer
697 views

Examples of (co)ends

3 votes
1 answer
275 views

Is the kernel of an action of a Hopf algebra on an algebra a biideal?

15 votes
3 answers
1k views

What is known about the category of Hopf algebras?

0 votes
0 answers
81 views

Semicharacters on groups

5 votes
1 answer
206 views

Are linear continuous mappings open on totally bounded sets?

4 votes
4 answers
642 views

On Köthe sequence spaces

1 vote
0 answers
72 views

"Constructive" proof that compact sets $K\subseteq L_1(\mu\times\nu)$ are contained in products $S\widehat{\otimes} T$

1 vote
1 answer
164 views

Integrable functions as elements of closed absolutely convex hulls of precompact sets of indicator functions

9 votes
2 answers
696 views

Tannaka-Krein duality in Chari-Pressley's book

4 votes
1 answer
449 views

Krein's theorem in the Tannaka-Krein duality

6 votes
0 answers
463 views

"Fundamental theorem for Hopf modules"

5 votes
1 answer
337 views

Tannaka duality for closed monoidal categories

7 votes
2 answers
244 views

Multiplication and division by a morphism under the “inner composition” in closed monoidal categories