Question

Proof verification: An arrow which is monic under a faithful functor is itself monic

score 112 · Answer 1 · 2026-04-23 14:54:11

112

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Proof verification: An arrow which is monic under a faithful functor is itself monic

Published on 23 Apr 2026 - 14:54

score 122 · Answer 2 · 2026-04-10 17:07:57

122

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Geometry with circle and triangle.

Published on 10 Apr 2026 - 17:07

score 2.1k · Answer 3 · 2026-04-15 21:25:31

2.1k

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Let k be an integer. Disprove: “The equation $x^2 − x − k = 0$ has no integer solution if and only if $k$ is odd.”

Published on 15 Apr 2026 - 21:25

score 165 · Answer 4 · 2026-04-12 07:14:17

165

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Show that $\bigcap_{a \in G} a H a^{-1}$ is a normal subgroup of $G$.

Published on 12 Apr 2026 - 7:14

score 65 · Answer 5 · 2026-04-10 05:44:35

65

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Some basic questions about two definition of limit point in Zorich‘s "Mathematical Analysis I"

Published on 10 Apr 2026 - 5:44

score 2.2k · Answer 6 · 2026-04-15 10:27:01

2.2k

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Degree of the extension $\mathbb{Q}(\sqrt{3 + 2\sqrt{2}})$.

Published on 15 Apr 2026 - 10:27

score 87 · Answer 7 · 2026-04-16 18:47:25

87

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Proof verification- $ \sigma $ - Algebra, Algebra, Ring

Published on 16 Apr 2026 - 18:47

score 31 · Answer 8 · 2026-04-14 11:31:13

31

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$ \mu $ premeasure and continousness - proof verification

Published on 14 Apr 2026 - 11:31

score 164 · Answer 9 · 2026-04-13 19:06:00

164

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Proof validation $\lim_{n\to\infty} \left(1+\sum_{k=1}^n \frac{(-1)^k}{k!}\right) = {1\over e}$

Published on 13 Apr 2026 - 19:06

score 34 · Answer 10 · 2026-04-29 04:04:49

34

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Proving $(A\times B)'\supset A'\times B'$

Published on 29 Apr 2026 - 4:04

score 8.4k · Answer 11 · 2026-04-17 05:21:26

8.4k

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Proof of: If $P(A) = P(B) = 1$ then $P(A \cap B) = 1$.

Published on 17 Apr 2026 - 5:21

score 1.2k · Answer 12 · 2026-04-14 13:09:25

1.2k

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Show that $X$, $Y$, and $Z$ are pairwise independent. Are they independent?

Published on 14 Apr 2026 - 13:09

score 32 · Answer 13 · 2026-04-08 21:27:41

32

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Verification: Investigation of a linear map on surjectivity and injectivity

Published on 08 Apr 2026 - 21:27

score 38 · Answer 14 · 2026-04-29 04:05:29

38

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Proving $\mathbb{R}^n$ bounded implies $-M\leqslant x_i\leqslant M$

Published on 29 Apr 2026 - 4:05

score 154 · Answer 15 · 2026-04-10 02:50:23

154

Views

An easy example of an inverse system which is not the constant inverse system

Published on 10 Apr 2026 - 2:50

List Question

Proof verification: An arrow which is monic under a faithful functor is itself monic

Geometry with circle and triangle.

Let k be an integer. Disprove: “The equation $x^2 − x − k = 0$ has no integer solution if and only if $k$ is odd.”

Show that $\bigcap_{a \in G} a H a^{-1}$ is a normal subgroup of $G$.

Some basic questions about two definition of limit point in Zorich‘s "Mathematical Analysis I"

Degree of the extension $\mathbb{Q}(\sqrt{3 + 2\sqrt{2}})$.

Proof verification- $ \sigma $ - Algebra, Algebra, Ring

$ \mu $ premeasure and continousness - proof verification

Proof validation $\lim_{n\to\infty} \left(1+\sum_{k=1}^n \frac{(-1)^k}{k!}\right) = {1\over e}$

Proving $(A\times B)'\supset A'\times B'$

Proof of: If $P(A) = P(B) = 1$ then $P(A \cap B) = 1$.

Show that $X$, $Y$, and $Z$ are pairwise independent. Are they independent?

Verification: Investigation of a linear map on surjectivity and injectivity

Proving $\mathbb{R}^n$ bounded implies $-M\leqslant x_i\leqslant M$

An easy example of an inverse system which is not the constant inverse system

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