User Jack L.

12 votes

Axiomatic construction of trigonometric functions

answered Jul 7, 2022 at 17:31

11 votes

Accepted

Subtracting the weak limit reduces the norm in the limit

answered Dec 7, 2020 at 6:10

7 votes

Accepted

On a certain norm of the identity operator on $\mathbb R^2$

answered Dec 14, 2020 at 7:22

7 votes

Jordan curves admitting only acyclic inscriptions of squares

answered Oct 7, 2020 at 21:14

7 votes

Accepted

Do consecutive integers have a big prime factor?

answered Jul 29, 2022 at 11:09

6 votes

Analytic continuation of convergent integral

answered Dec 17, 2020 at 6:38

4 votes

Scottish Book Problem 172

answered Oct 8, 2020 at 0:02

4 votes

Accepted

Is there a non-degenerate quadratic form on every finite abelian group?

answered Oct 14, 2020 at 12:02

3 votes

Accepted

Sign changes of a sequence

answered Oct 16, 2020 at 2:07

3 votes

Accepted

Periodical functions with $f^{(n)} = f$, but $f^{(k)} \neq f$ for $k\in \{1,\ldots,n-1\}$

answered Nov 25, 2020 at 8:38

3 votes

What are the main open problems in Group Theory and Galois Theory?

answered Feb 6, 2021 at 16:40

2 votes

Convex set with no interior contained in hyperplane?

answered May 1, 2021 at 10:01

2 votes

Non-singular matrix with restricted entries

answered Nov 12, 2020 at 7:36

2 votes

Accepted

Is a mixture of $\ell_p$-norms $\eta(x):=\lVert x\rVert_2 + r\lVert x\rVert_p$ always dimensionlessly equivalent to some $\ell_q$-norm?

answered Aug 7, 2022 at 13:27

2 votes

Accepted

Coincidence of sequential weak star closure and weak star closure

answered Aug 19, 2022 at 8:47

1 vote

Is there a way to find all number series whose formulae of general term contain progressions?

answered Aug 4, 2022 at 9:42

1 vote

Inclusion of infinite intersection

answered Oct 27, 2020 at 9:41

1 vote

For $n$ different sets whose union has size $n+1$ ,can you remove the same point from each set while retaining their difference

answered Nov 11, 2020 at 21:42

1 vote

Does the definition of limit correspond to the intuitive notion?

answered Dec 28, 2020 at 17:03

1 vote

Search for gaps between primes where each composite is divisible by increasing integers (2, 3, 4, ...)

answered Dec 28, 2020 at 22:33

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20 Answers

Axiomatic construction of trigonometric functions

Subtracting the weak limit reduces the norm in the limit

On a certain norm of the identity operator on $\mathbb R^2$

Jordan curves admitting only acyclic inscriptions of squares

Do consecutive integers have a big prime factor?

Analytic continuation of convergent integral

Scottish Book Problem 172

Is there a non-degenerate quadratic form on every finite abelian group?

Sign changes of a sequence

Periodical functions with $f^{(n)} = f$, but $f^{(k)} \neq f$ for $k\in \{1,\ldots,n-1\}$

What are the main open problems in Group Theory and Galois Theory?

Convex set with no interior contained in hyperplane?

Non-singular matrix with restricted entries

Is a mixture of $\ell_p$-norms $\eta(x):=\lVert x\rVert_2 + r\lVert x\rVert_p$ always dimensionlessly equivalent to some $\ell_q$-norm?

Coincidence of sequential weak star closure and weak star closure

Is there a way to find all number series whose formulae of general term contain progressions?

Inclusion of infinite intersection

For $n$ different sets whose union has size $n+1$ ,can you remove the same point from each set while retaining their difference

Does the definition of limit correspond to the intuitive notion?

Search for gaps between primes where each composite is divisible by increasing integers (2, 3, 4, ...)