Question

Convergence/divergence of $\sum_{n=1}^{\infty} \frac{{(-1)}^n \tan{(n)}}{n^2}$

score 109 · Answer 1 · 2026-04-15 07:48:31

109

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Convergence/divergence of $\sum_{n=1}^{\infty} \frac{{(-1)}^n \tan{(n)}}{n^2}$

Published on 15 Apr 2026 - 7:48

score 85 · Answer 2 · 2026-03-26 06:29:48

85

Views

Mappings out of quotient set by a generated equivalence relation (Colimits in Set)

Published on 26 Mar 2026 - 6:29

score 190 · Answer 3 · 2026-04-14 11:19:27

190

Views

Conditional Expectation | Independent sigma-fields and uniqueness theorem

Published on 14 Apr 2026 - 11:19

score 80 · Answer 4 · 2026-04-10 07:57:34

80

Views

Understanding proof of Jensen's inequality in Lieb-Loss

Published on 10 Apr 2026 - 7:57

score 77 · Answer 5 · 2026-04-15 18:06:54

77

Views

Prove that $n !$ is a divisor of $ \prod_{k=0}^{n-1}\left(2^{n}-2^{k}\right) $

Published on 15 Apr 2026 - 18:06

score 304 · Answer 6 · 2026-03-26 13:02:18

304

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A question regarding the proof of $\gcd(a^m-1, a^n-1) = a^{\gcd(m,n)}-1$

Published on 26 Mar 2026 - 13:02

score 155 · Answer 7 · 2026-04-15 13:50:57

155

Views

Is this proof valid to prove that $F(x)-G(x)$ is always non zero?

Published on 15 Apr 2026 - 13:50

score 511 · Answer 8 · 2026-04-14 12:30:23

511

Views

Grothendieck's axiom for abelian categories: AB5 and AB4, understanding a proof from Popescu's book

Published on 14 Apr 2026 - 12:30

score 70 · Answer 9 · 2026-04-16 04:04:47

70

Views

Would a finite number of primes imply there would be a finite number of secure exchanges on the internet?

Published on 16 Apr 2026 - 4:04

score 38 · Answer 10 · 2026-04-16 01:19:26

38

Views

Prove that $a_{n}\to L$ as $n\to\infty$ iff $\limsup_{n\to\infty}(a_{n}) = \liminf_{n\to\infty}(a_{n}) = L$

Published on 16 Apr 2026 - 1:19

score 373 · Answer 11 · 2026-04-13 01:07:14

373

Views

Proof of $\text{Dom}(R^{-1}) = \text{Ran}(R)$

Published on 13 Apr 2026 - 1:07

score 55 · Answer 12 · 2026-04-17 15:20:45

55

Views

Suppose $d(P, Q) = d(R, S)$. Prove that $d(P, R) = d(Q, S)$.

Published on 17 Apr 2026 - 15:20

score 89 · Answer 13 · 2026-04-15 09:34:23

89

Views

Curve25519 prove of theorem

Published on 15 Apr 2026 - 9:34

score 889 · Answer 14 · 2026-04-09 19:29:00

889

Views

Proof of Stone's Theorem on unitary groups

Published on 09 Apr 2026 - 19:29

score 69 · Answer 15 · 2026-04-28 18:38:31

69

Views

What can we know about undiscovered proofs?

Published on 28 Apr 2026 - 18:38

List Question

Convergence/divergence of $\sum_{n=1}^{\infty} \frac{{(-1)}^n \tan{(n)}}{n^2}$

Mappings out of quotient set by a generated equivalence relation (Colimits in Set)

Conditional Expectation | Independent sigma-fields and uniqueness theorem

Understanding proof of Jensen's inequality in Lieb-Loss

Prove that $n !$ is a divisor of $ \prod_{k=0}^{n-1}\left(2^{n}-2^{k}\right) $

A question regarding the proof of $\gcd(a^m-1, a^n-1) = a^{\gcd(m,n)}-1$

Is this proof valid to prove that $F(x)-G(x)$ is always non zero?

Grothendieck's axiom for abelian categories: AB5 and AB4, understanding a proof from Popescu's book

Would a finite number of primes imply there would be a finite number of secure exchanges on the internet?

Prove that $a_{n}\to L$ as $n\to\infty$ iff $\limsup_{n\to\infty}(a_{n}) = \liminf_{n\to\infty}(a_{n}) = L$

Proof of $\text{Dom}(R^{-1}) = \text{Ran}(R)$

Suppose $d(P, Q) = d(R, S)$. Prove that $d(P, R) = d(Q, S)$.

Curve25519 prove of theorem

Proof of Stone's Theorem on unitary groups

What can we know about undiscovered proofs?

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