Question

Metric space with every infinite set having a limit point

score 1.1k · Answer 1 · 2017-02-26 10:11:06

1.1k

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Metric space with every infinite set having a limit point

Published on 26 Feb 2017 - 10:11

score 157 · Answer 2 · 2017-02-26 14:16:25

157

Views

Proof that $CE=2AD$

Published on 26 Feb 2017 - 14:16

score 55 · Answer 3 · 2017-03-01 16:36:21

55

Views

Abstract algebra(group theory) - alternative proof (property of general linear group)

Published on 01 Mar 2017 - 16:36

score 69 · Answer 4 · 2017-03-01 17:25:34

69

Views

Prove prime $p\mid ab\,\Rightarrow\, p\mid a\,$ or $\,p\mid b\,$ without using Fundamental Theorem of Arithmetic

Published on 01 Mar 2017 - 17:25

score 138 · Answer 5 · 2026-04-02 20:11:02

138

Views

logically prove: $R$ is Relation $\to R\subseteq\operatorname{dom}(R)\times \operatorname{cod}(R)$

Published on 02 Apr 2026 - 20:11

score 1.8k · Answer 6 · 2026-04-01 04:39:19

1.8k

Views

Proof of this property: $x=0$ if and only if $|x|<z$ for all $z>0$

Published on 01 Apr 2026 - 4:39

score 2.6k · Answer 7 · 2026-03-31 22:47:51

2.6k

Views

How to prove complex-valued $\lim\limits_{z\to i}\left(\frac{iz^3 - 1}{z + i}\right) = 0$ via epsilon$-$delta definition?

Published on 31 Mar 2026 - 22:47

score 275 · Answer 8 · 2026-03-28 14:25:59

275

Views

Are there any geometric proofs for these series relating to pi?

Published on 28 Mar 2026 - 14:25

score 330 · Answer 9 · 2017-03-08 17:33:54

330

Views

Different proof that $\overline{A\cup B}\subset \overline{A}\cup \overline{B}$

Published on 08 Mar 2017 - 17:33

score 1.8k · Answer 10 · 2026-03-29 08:35:55

1.8k

Views

$\lim\limits_{x \to 0}{\frac{\cos x - \cos 2x}{1 - \cos x}}$

Published on 29 Mar 2026 - 8:35

score 480 · Answer 11 · 2026-03-26 12:41:23

480

Views

Lie Derivative Identity for Contracted Tensors

Published on 26 Mar 2026 - 12:41

score 114 · Answer 12 · 2017-03-11 17:21:53

114

Views

direct proof of $U_1\cup U_2$ is subspace of $V$ $\implies$ $U_1\subset U_2$ or $U_2\subset U_1$

Published on 11 Mar 2017 - 17:21

score 111 · Answer 13 · 2017-03-13 20:16:56

111

Views

Given a continuous function $f : I → R$, show that if $f$ is diﬀerentiable at $c$ and $c$ is a local extremum, then $f'(c) = 0$.

Published on 13 Mar 2017 - 20:16

score 107 · Answer 14 · 2017-03-16 14:41:41

107

Views

Theorem 2.1 in Stein Shakarchi , p37, unnecessary path?

Published on 16 Mar 2017 - 14:41

score 76 · Answer 15 · 2017-03-23 01:16:36

A direct proof that there exists a real number for which there is no rational number which differs at every point of its decimal expansion

List Question

Metric space with every infinite set having a limit point

Proof that $CE=2AD$

Abstract algebra(group theory) - alternative proof (property of general linear group)

Prove prime $p\mid ab\,\Rightarrow\, p\mid a\,$ or $\,p\mid b\,$ without using Fundamental Theorem of Arithmetic

logically prove: $R$ is Relation $\to R\subseteq\operatorname{dom}(R)\times \operatorname{cod}(R)$

Proof of this property: $x=0$ if and only if $|x|<z$ for all $z>0$

How to prove complex-valued $\lim\limits_{z\to i}\left(\frac{iz^3 - 1}{z + i}\right) = 0$ via epsilon$-$delta definition?

Are there any geometric proofs for these series relating to pi?

Different proof that $\overline{A\cup B}\subset \overline{A}\cup \overline{B}$

$\lim\limits_{x \to 0}{\frac{\cos x - \cos 2x}{1 - \cos x}}$

Lie Derivative Identity for Contracted Tensors

direct proof of $U_1\cup U_2$ is subspace of $V$ $\implies$ $U_1\subset U_2$ or $U_2\subset U_1$

Given a continuous function $f : I → R$, show that if $f$ is diﬀerentiable at $c$ and $c$ is a local extremum, then $f'(c) = 0$.

Theorem 2.1 in Stein Shakarchi , p37, unnecessary path?

A direct proof that there exists a real number for which there is no rational number which differs at every point of its decimal expansion

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