User მამუკა ჯიბლაძე

44 votes

2 answers

7k views

What is known about the sum x^{n^2}/n?

asked Oct 28, 2013 at 11:48

35 votes

1 answer

2k views

Are there topological versions of the idea of divisor?

asked Jun 12, 2017 at 6:11

35 votes

12 answers

3k views

No canonical isomorphism [duplicate]

asked Apr 22, 2021 at 20:57

32 votes

1 answer

3k views

Have you ever seen this bizarre commutative algebra?

asked Dec 24, 2018 at 6:40

28 votes

2 answers

2k views

Has anyone seen a nice map of multiplicative cohomology theories?

asked Jul 6, 2017 at 13:28

27 votes

1 answer

1k views

What is the name of this combinatorial object and place to read about it?

asked Nov 26, 2016 at 16:02

26 votes

1 answer

940 views

Are (semi)simple Lie groups some sort of "homotopy quotient groups" of their maximal tori?

asked Apr 8, 2018 at 19:22

23 votes

0 answers

647 views

Is this a model for $K$-theory of a triangulated category?

asked Apr 20, 2016 at 7:12

22 votes

6 answers

3k views

How strong is Cantor-Bernstein-Schröder?

asked Dec 11, 2015 at 8:37

22 votes

3 answers

1k views

Roots of Bernoulli polynomials - a pattern

asked May 20, 2017 at 8:10

22 votes

3 answers

2k views

Stable homotopy type theory?

asked Oct 12, 2017 at 22:04

19 votes

2 answers

2k views

Is there an explicit expression for Chebyshev polynomials modulo $x^r-1$?

asked Nov 21, 2017 at 13:25

19 votes

2 answers

781 views

"Fractally self-similar" numbers

asked Nov 30, 2015 at 13:12

19 votes

2 answers

1k views

Exponentiation of vector spaces?

asked Sep 30, 2015 at 4:13

18 votes

0 answers

987 views

"Special" meanders

asked Nov 3, 2013 at 9:50

18 votes

2 answers

1k views

Anything between vector bundles and sphere bundles?

asked Feb 7, 2015 at 7:19

18 votes

3 answers

2k views

Can $\mathcal O_X$ be recognized abstract-nonsensically?

asked Dec 9, 2016 at 5:37

18 votes

3 answers

7k views

What is so special about set theory anyway? [closed]

asked Apr 16, 2018 at 4:55

17 votes

0 answers

602 views

Trying to reconcile two facts about the Appell-Lerch sum learned from Polishchuk and Zwegers

asked Apr 2, 2017 at 18:59

17 votes

0 answers

433 views

Need explicit formula for certain "$q$-numbers" involving gcd's

asked Jun 30, 2015 at 7:37

16 votes

0 answers

784 views

What would be the simplest analog of Langlands in algebraic topology?

asked Aug 23, 2018 at 4:43

16 votes

0 answers

755 views

Is there a "natural" proof of the equality $4^2=2^4$?

asked Dec 12, 2020 at 15:38

16 votes

1 answer

669 views

Is there a higher analog of "category with all same side inverses is a groupoid"?

asked Dec 11, 2022 at 5:21

15 votes

2 answers

740 views

Seeking a more symmetric realization of a configuration of 10 planes, 25 lines and 15 points in projective space

asked Oct 18, 2018 at 22:36

15 votes

1 answer

756 views

Which spaces have trivial K-theory?

asked Dec 30, 2018 at 6:41

15 votes

1 answer

558 views

Combinatorics of palindromic decompositions

asked Mar 27, 2015 at 8:23

15 votes

1 answer

759 views

How many traces are there on Temperley-Lieb, Fuss-Catalan, Iwahori-Hecke, Birman-Wenzl-Murakami-Kauffman, ... algebras?

asked May 25, 2015 at 10:57

15 votes

2 answers

1k views

"Economic" CW-structure for Eilenberg-MacLane spaces?

asked Sep 6, 2014 at 16:02

14 votes

3 answers

1k views

A seemingly simple combinatorial object that must have an easy generating function

asked Feb 8, 2016 at 10:56

14 votes

1 answer

1k views

Are Spanier-Whitehead duals of general spaces expressible through some generalization of normal bundles?

asked Jan 19, 2021 at 6:40

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160 Questions

What is known about the sum x^{n^2}/n?

Are there topological versions of the idea of divisor?

No canonical isomorphism [duplicate]

Have you ever seen this bizarre commutative algebra?

Has anyone seen a nice map of multiplicative cohomology theories?

What is the name of this combinatorial object and place to read about it?

Are (semi)simple Lie groups some sort of "homotopy quotient groups" of their maximal tori?

Is this a model for $K$-theory of a triangulated category?

How strong is Cantor-Bernstein-Schröder?

Roots of Bernoulli polynomials - a pattern

Stable homotopy type theory?

Is there an explicit expression for Chebyshev polynomials modulo $x^r-1$?

"Fractally self-similar" numbers

Exponentiation of vector spaces?

"Special" meanders

Anything between vector bundles and sphere bundles?

Can $\mathcal O_X$ be recognized abstract-nonsensically?

What is so special about set theory anyway? [closed]

Trying to reconcile two facts about the Appell-Lerch sum learned from Polishchuk and Zwegers

Need explicit formula for certain "$q$-numbers" involving gcd's

What would be the simplest analog of Langlands in algebraic topology?

Is there a "natural" proof of the equality $4^2=2^4$?

Is there a higher analog of "category with all same side inverses is a groupoid"?

Seeking a more symmetric realization of a configuration of 10 planes, 25 lines and 15 points in projective space

Which spaces have trivial K-theory?

Combinatorics of palindromic decompositions

How many traces are there on Temperley-Lieb, Fuss-Catalan, Iwahori-Hecke, Birman-Wenzl-Murakami-Kauffman, ... algebras?

"Economic" CW-structure for Eilenberg-MacLane spaces?

A seemingly simple combinatorial object that must have an easy generating function

Are Spanier-Whitehead duals of general spaces expressible through some generalization of normal bundles?