List questions from alternative-proof

Published on 13 Apr 2026 - 22:31

58

Views

An intuitive approach to solving a question of geometry

Published on 16 Apr 2026 - 18:36

241

Views

Proving $e^x\ge0$

Published on 14 Apr 2026 - 5:29

890

Views

Elementary proof that there is no field with 6 elements

Published on 16 Apr 2026 - 5:10

59

Views

Is there a simple proof for $\sup_{|x|\le \delta} \frac{|e^{ax} - 1|}{|x|} \le \frac{e^{|a|\delta}}{\delta}$?

Published on 11 Apr 2026 - 5:27

75

Views

$\mathbf{R}^*$ be a group where the operation is multiplication, the group G is 2x2 matrices with non-zero determinant. Is f isomorphic and ...?

Published on 14 Apr 2026 - 1:47

500

Views

Different proof that a subgroup of index $2$ is normal

Published on 13 Apr 2026 - 1:02

179

Views

Prove $\int_0^1\frac{\text{Li}_2(-x^2)}{\sqrt{1-x^2}}\,dx=\pi\int_0^1\frac{\ln\left(\frac{2}{1+\sqrt{1+x}}\right)}{x}\,dx$

Published on 16 Apr 2026 - 19:56

64

Views

Divergence of $\sum\limits_{k=1}^n\sin(\frac{x}{k})$

Published on 13 Apr 2026 - 19:49

176

Views

Exercise 4.4 of Baby Rudin

Published on 14 Apr 2026 - 21:21

129

Views

Show that $\sum_{n=3}^{\infty} \frac{1}{(\log \log n)^{\log \log n}}\quad $ diverges.

Published on 17 Apr 2026 - 7:54

80

Views

How would someone find a proof for this?

Published on 12 Apr 2026 - 0:35

72

Views

If $\mathcal{F} \subset \mathcal{P(}\{1,2,\ldots,n\})$ then exists disjoint $I,J\subset\mathcal{F}$ so that $\bigcup_{X\in I} X=\bigcup_{Y\in J} Y$.

Published on 13 Apr 2026 - 16:45

141

Views

15 Puzzle question - trying to understand the proof

Published on 13 Apr 2026 - 23:57

27

Views

Problems with the sets using the cardinality and the operations

Published on 14 Apr 2026 - 3:44

List Question

Is this proof of the Graham-Pollak Theorem correct?

An intuitive approach to solving a question of geometry

Proving $e^x\ge0$

Elementary proof that there is no field with 6 elements

Is there a simple proof for $\sup_{|x|\le \delta} \frac{|e^{ax} - 1|}{|x|} \le \frac{e^{|a|\delta}}{\delta}$?

$\mathbf{R}^*$ be a group where the operation is multiplication, the group G is 2x2 matrices with non-zero determinant. Is f isomorphic and ...?

Different proof that a subgroup of index $2$ is normal

Prove $\int_0^1\frac{\text{Li}_2(-x^2)}{\sqrt{1-x^2}}\,dx=\pi\int_0^1\frac{\ln\left(\frac{2}{1+\sqrt{1+x}}\right)}{x}\,dx$

Divergence of $\sum\limits_{k=1}^n\sin(\frac{x}{k})$

Exercise 4.4 of Baby Rudin

Show that $\sum_{n=3}^{\infty} \frac{1}{(\log \log n)^{\log \log n}}\quad $ diverges.

How would someone find a proof for this?

If $\mathcal{F} \subset \mathcal{P(}\{1,2,\ldots,n\})$ then exists disjoint $I,J\subset\mathcal{F}$ so that $\bigcup_{X\in I} X=\bigcup_{Y\in J} Y$.

15 Puzzle question - trying to understand the proof

Problems with the sets using the cardinality and the operations

Trending Questions

Popular # Hahtags

Popular Questions