User Harry West

13 votes

Without choice, can every homomorphism from a profinite group to a finite group be continuous?

answered Aug 7, 2021 at 11:31

12 votes

Accepted

Is there an example of a non measurable function with a measurable graph?

answered Nov 15, 2020 at 9:49

11 votes

Accepted

Existence of translation-invariant basis on $C_c(\mathbb R)$

answered May 7, 2021 at 8:51

8 votes

Detecting uncountable cardinals in $(\mathbb{R};+,\times,\mathbb{N})$

answered Aug 2, 2021 at 4:41

7 votes

Accepted

Does the random graph interpret the random directed graph?

answered Jul 21, 2021 at 19:25

6 votes

Accepted

Can second-order logic identify "amorphous satisfiability"?

answered Jul 9, 2021 at 8:25

6 votes

Accepted

Comparing sizes of sets of integers

answered Sep 8, 2020 at 0:05

5 votes

Accepted

Ordinary generating functions with finitely many singularities at algebraic numbers are rational

answered Jun 5, 2021 at 9:22

5 votes

Accepted

Category with few endofunctors?

answered Aug 28, 2021 at 10:15

4 votes

Accepted

Topological complexity of ultrafilters in $2^\kappa$ for uncountable $\kappa$

answered Oct 23, 2020 at 5:18

4 votes

Accepted

Does set of finitely additive probability measures embed linearly into a strictly convex dual Banach space?

answered Nov 13, 2020 at 18:11

4 votes

Accepted

Functions over monoids which factor in two different ways

answered Aug 10, 2021 at 7:12

3 votes

Accepted

Is Axiom of Choice for convex sets of distributions on naturals necessary?

answered May 18, 2021 at 18:22

3 votes

Accepted

Example of an inverse system which suddenly "jumps" in size in a specific "controlled" way?

answered Nov 18, 2020 at 14:27

3 votes

Accepted

Is this notion of finiteness closed under unions?

answered Jun 24, 2021 at 18:39

2 votes

Accepted

Is the hereditary version of this weak finiteness notion nontrivial?

answered Nov 25, 2020 at 18:43

2 votes

Do all countable $\omega$-standard models of ZF with an amorphous set have the same inclusion relation up to isomorphism?

answered Jul 16, 2021 at 9:53

1 vote

Accepted

If a vector space has a basis then its dual vector space has a basis

answered Jul 22, 2021 at 19:56

1 vote

Accepted

Are there "very narrow" undetermined games?

answered Jun 27, 2021 at 20:14

1 vote

Accepted

A new cardinality living in every forcing extension?

answered Jun 29, 2021 at 5:40

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20 Answers

Without choice, can every homomorphism from a profinite group to a finite group be continuous?

Is there an example of a non measurable function with a measurable graph?

Existence of translation-invariant basis on $C_c(\mathbb R)$

Detecting uncountable cardinals in $(\mathbb{R};+,\times,\mathbb{N})$

Does the random graph interpret the random directed graph?

Can second-order logic identify "amorphous satisfiability"?

Comparing sizes of sets of integers

Ordinary generating functions with finitely many singularities at algebraic numbers are rational

Category with few endofunctors?

Topological complexity of ultrafilters in $2^\kappa$ for uncountable $\kappa$

Does set of finitely additive probability measures embed linearly into a strictly convex dual Banach space?

Functions over monoids which factor in two different ways

Is Axiom of Choice for convex sets of distributions on naturals necessary?

Example of an inverse system which suddenly "jumps" in size in a specific "controlled" way?

Is this notion of finiteness closed under unions?

Is the hereditary version of this weak finiteness notion nontrivial?

Do all countable $\omega$-standard models of ZF with an amorphous set have the same inclusion relation up to isomorphism?

If a vector space has a basis then its dual vector space has a basis

Are there "very narrow" undetermined games?

A new cardinality living in every forcing extension?