Question

How is a standard $2$-simplex oriented? How is a standard $n$-simplex oriented?

score 765 · Answer 1 · 2026-03-25 15:57:17

765

Views

How is a standard $2$-simplex oriented? How is a standard $n$-simplex oriented?

Published on 25 Mar 2026 - 15:57

score 89 · Answer 2 · 2019-02-20 04:26:55

89

Views

Is my intuition of imaginary numbers correct?

Published on 20 Feb 2019 - 4:26

score 74 · Answer 3 · 2019-02-20 17:12:49

74

Views

In computing $\partial: C_2(T) \to C_1(T)$ of the torus, why is $\partial(U)=a+b-c$? Why is the cell structure of the torus oriented this way?

Published on 20 Feb 2019 - 17:12

score 707 · Answer 4 · 2019-02-21 03:26:45

707

Views

How is $\mathbb R \to S^1$ nullhomotopic?

Published on 21 Feb 2019 - 3:26

score 786 · Answer 5 · 2026-03-27 13:19:22

786

Views

Convincing yourself about choice of axioms for predicate calculus

Published on 27 Mar 2026 - 13:19

score 111 · Answer 6 · 2019-02-22 21:17:19

111

Views

How to see that this space with two vertices and four edges is homotopy equivalent to $S^1 \vee S^1 \vee S^1$?

Published on 22 Feb 2019 - 21:17

score 48 · Answer 7 · 2019-02-23 21:00:29

48

Views

Is $\mathbb Q(\sqrt 2) \times \mathbb Q(\sqrt 3)=\mathbb Q(\sqrt 2,\sqrt 3)$ if I prove $\sqrt 2,\sqrt 3$ are L.I. over $\mathbb Q$?

Published on 23 Feb 2019 - 21:00

score 1.2k · Answer 8 · 2019-02-23 21:24:20

1.2k

Views

If $f$ and $g$ are one-to-one, then $gf$ is one-to-one.

Published on 23 Feb 2019 - 21:24

score 468 · Answer 9 · 2019-02-24 23:29:43

468

Views

Understanding the definition of "proper maps" in Differential Topology by Guillemin and Pollack

Published on 24 Feb 2019 - 23:29

score 1.3k · Answer 10 · 2026-03-25 01:41:16

1.3k

Views

Kernel and image of matrix: What are they? Why do they exist?

Published on 25 Mar 2026 - 1:41

score 276 · Answer 11 · 2019-02-26 14:14:13

276

Views

Conditional expectation should be $\cal F$ a measurable.

Published on 26 Feb 2019 - 14:14

score 238 · Answer 12 · 2026-03-25 07:40:42

238

Views

Remembering the golden ratio

Published on 25 Mar 2026 - 7:40

score 120 · Answer 13 · 2019-02-27 15:42:24

120

Views

How to prove that a function has a maximum and a minimum

Published on 27 Feb 2019 - 15:42

score 332 · Answer 14 · 2026-03-27 13:19:19

332

Views

Intuition behind a structure of a language in mathematical logic [long read but simple]

Published on 27 Mar 2026 - 13:19

score 36 · Answer 15 · 2026-03-27 10:10:43

36

Views

Independence of Intersection of Chords in a cirle

Published on 27 Mar 2026 - 10:10

List Question

How is a standard $2$-simplex oriented? How is a standard $n$-simplex oriented?

Is my intuition of imaginary numbers correct?

In computing $\partial: C_2(T) \to C_1(T)$ of the torus, why is $\partial(U)=a+b-c$? Why is the cell structure of the torus oriented this way?

How is $\mathbb R \to S^1$ nullhomotopic?

Convincing yourself about choice of axioms for predicate calculus

How to see that this space with two vertices and four edges is homotopy equivalent to $S^1 \vee S^1 \vee S^1$?

Is $\mathbb Q(\sqrt 2) \times \mathbb Q(\sqrt 3)=\mathbb Q(\sqrt 2,\sqrt 3)$ if I prove $\sqrt 2,\sqrt 3$ are L.I. over $\mathbb Q$?

If $f$ and $g$ are one-to-one, then $gf$ is one-to-one.

Understanding the definition of "proper maps" in Differential Topology by Guillemin and Pollack

Kernel and image of matrix: What are they? Why do they exist?

Conditional expectation should be $\cal F$ a measurable.

Remembering the golden ratio

How to prove that a function has a maximum and a minimum

Intuition behind a structure of a language in mathematical logic [long read but simple]

Independence of Intersection of Chords in a cirle

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