Question

Is my proof for all these statements are equivalent correct?

score 24 · Answer 1 · 2017-01-06 03:06:18

24

Views

Is my proof for all these statements are equivalent correct?

Published on 06 Jan 2017 - 3:06

score 923 · Answer 2 · 2017-01-06 20:01:18

923

Views

Prove that if $A$ and $B$ are subsets of a topological space $(X, \mathcal{T})$, then $\overline{A \cup B} = \overline{A} \cup \overline{B}$

Published on 06 Jan 2017 - 20:01

score 2.8k · Answer 3 · 2017-01-07 05:33:56

2.8k

Views

Normalizer of upper triangular group in ${\rm GL}(n,F)$

Published on 07 Jan 2017 - 5:33

score 248 · Answer 4 · 2026-03-26 04:53:06

248

Views

If $A\in\mathcal M_n(\Bbb R)$ is nilpotent matrix such that $\ker(A)=\ker(A^T)$ then $A=0$.

Published on 26 Mar 2026 - 4:53

score 73 · Answer 5 · 2017-01-09 17:50:17

73

Views

Proof verification of Lemma $3.2$ by Sleziak, Toma, Das

Published on 09 Jan 2017 - 17:50

score 717 · Answer 6 · 2017-01-10 03:53:33

717

Views

Is it possible to prove that there are infinitely many primes without the fundamental theorem of arithmetic?

Published on 10 Jan 2017 - 3:53

score 532 · Answer 7 · 2017-01-10 19:28:09

532

Views

Computing $\lim_n \frac{n}{2^n}\sum_{k=1}^n \frac{2^k}{k}$

Published on 10 Jan 2017 - 19:28

score 401 · Answer 8 · 2017-01-11 12:12:45

401

Views

Equating trigonometric identities: $\sqrt3\cos x - \sin x=0$

Published on 11 Jan 2017 - 12:12

score 433 · Answer 9 · 2017-01-12 09:12:08

433

Views

The sum of powers $\sum_{k=0}^n k^4$.

Published on 12 Jan 2017 - 9:12

score 77 · Answer 10 · 2026-04-04 03:24:34

77

Views

Proof that N to the power 0 is 1 using square roots

Published on 04 Apr 2026 - 3:24

score 570 · Answer 11 · 2026-04-01 02:49:55

570

Views

How to evaluate $\lim _{x\to \infty }\left(\frac{x+3}{\sqrt{x^2-5x}}\right)^{x^2\sin\left(1/x\right)}$?

Published on 01 Apr 2026 - 2:49

score 415 · Answer 12 · 2017-01-17 23:29:51

415

Views

Stronger Nakayama's Lemma

Published on 17 Jan 2017 - 23:29

score 1.2k · Answer 13 · 2017-01-18 02:41:23

1.2k

Views

Proof of basis for a box topology

Published on 18 Jan 2017 - 2:41

score 100 · Answer 14 · 2017-01-19 18:02:12

100

Views

Prove that it's possible to find two students in the same group

Published on 19 Jan 2017 - 18:02

score 152 · Answer 15 · 2017-01-20 03:10:52

152

Views

Prove that if $a_n \to a$ and $b_n \to b$ in $\Bbb R^d$ then $<a_n, b_n> \to <a, b>$

Published on 20 Jan 2017 - 3:10

List Question

Is my proof for all these statements are equivalent correct?

Prove that if $A$ and $B$ are subsets of a topological space $(X, \mathcal{T})$, then $\overline{A \cup B} = \overline{A} \cup \overline{B}$

Normalizer of upper triangular group in ${\rm GL}(n,F)$

If $A\in\mathcal M_n(\Bbb R)$ is nilpotent matrix such that $\ker(A)=\ker(A^T)$ then $A=0$.

Proof verification of Lemma $3.2$ by Sleziak, Toma, Das

Is it possible to prove that there are infinitely many primes without the fundamental theorem of arithmetic?

Computing $\lim_n \frac{n}{2^n}\sum_{k=1}^n \frac{2^k}{k}$

Equating trigonometric identities: $\sqrt3\cos x - \sin x=0$

The sum of powers $\sum_{k=0}^n k^4$.

Proof that N to the power 0 is 1 using square roots

How to evaluate $\lim _{x\to \infty }\left(\frac{x+3}{\sqrt{x^2-5x}}\right)^{x^2\sin\left(1/x\right)}$?

Stronger Nakayama's Lemma

Proof of basis for a box topology

Prove that it's possible to find two students in the same group

Prove that if $a_n \to a$ and $b_n \to b$ in $\Bbb R^d$ then $<a_n, b_n> \to <a, b>$

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