Question

Are there mathematical concepts that exist in dimension $4$, but not in dimension $3$?

score 8.2k · Answer 1 · 2026-03-25 11:13:35

8.2k

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Are there mathematical concepts that exist in dimension $4$, but not in dimension $3$?

Published on 25 Mar 2026 - 11:13

score 613 · Answer 2 · 2026-03-25 07:47:29

613

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Combinatorics problems that can be solved more easily using probability

Published on 25 Mar 2026 - 7:47

score 235 · Answer 3 · 2026-03-25 14:36:44

235

Views

Geometric properties of variety/scheme vs. algebraic properties of the coordinate ring

Published on 25 Mar 2026 - 14:36

score 168 · Answer 4 · 2026-03-25 23:09:02

168

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Any nice pedagogical examples of S-measurable functions?

Published on 25 Mar 2026 - 23:09

score 99 · Answer 5 · 2026-03-25 09:24:20

99

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What are the application of "completing the square" method?

Published on 25 Mar 2026 - 9:24

score 660 · Answer 6 · 2019-09-21 14:29:22

660

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Aesthetic proofs that involve Field Theory / Galois Theory

Published on 21 Sep 2019 - 14:29

score 157 · Answer 7 · 2019-09-24 18:18:32

157

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Looking for higher-degree polynomials that might be solvable in radicals

Published on 24 Sep 2019 - 18:18

score 1.1k · Answer 8 · 2019-09-26 06:41:05

1.1k

Views

When will a group be Abelian?

Published on 26 Sep 2019 - 6:41

score 328 · Answer 9 · 2014-03-12 00:24:50

328

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What is list of common integral that have no closed form?

Published on 12 Mar 2014 - 0:24

score 6.7k · Answer 10 · 2014-03-19 13:40:31

6.7k

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University-level books focusing on intuition?

Published on 19 Mar 2014 - 13:40

score 1.9k · Answer 11 · 2026-03-26 08:05:35

1.9k

Views

How do you compute group cohomology in practice?

Published on 26 Mar 2026 - 8:05

score 348 · Answer 12 · 2014-03-20 03:19:57

348

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Examples of non-trivial closed subschemes of a complete non-projective non-singular variety

Published on 20 Mar 2014 - 3:19

score 5.4k · Answer 13 · 2026-03-26 03:12:44

5.4k

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Surprising applications of cohomology

Published on 26 Mar 2026 - 3:12

score 182 · Answer 14 · 2014-03-23 23:48:08

182

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A big list of examples that a power of a prime ideal is not primary in an algebra of finite type over a field

Published on 23 Mar 2014 - 23:48

score 3.1k · Answer 15 · 2014-03-24 00:38:35

3.1k

Views

"Here's a cool problem": a collection of short questions with clever solutions

Published on 24 Mar 2014 - 0:38

List Question

Are there mathematical concepts that exist in dimension $4$, but not in dimension $3$?

Combinatorics problems that can be solved more easily using probability

Geometric properties of variety/scheme vs. algebraic properties of the coordinate ring

Any nice pedagogical examples of S-measurable functions?

What are the application of "completing the square" method?

Aesthetic proofs that involve Field Theory / Galois Theory

Looking for higher-degree polynomials that might be solvable in radicals

When will a group be Abelian?

What is list of common integral that have no closed form?

University-level books focusing on intuition?

How do you compute group cohomology in practice?

Examples of non-trivial closed subschemes of a complete non-projective non-singular variety

Surprising applications of cohomology

A big list of examples that a power of a prime ideal is not primary in an algebra of finite type over a field

"Here's a cool problem": a collection of short questions with clever solutions

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