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user10444
  • Member for 11 years, 3 months
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19 votes
4 answers
7k views

Showing that $\sqrt \pi$ is transcendental

9 votes
1 answer
2k views

Finite Abelian groups: $G \times H \cong G\times K$ then $H\cong K$

9 votes
1 answer
1k views

A question concerning multi-indices

9 votes
2 answers
4k views

Proving that an uncountable set has an uncountable subset whose complement is uncountable.

8 votes
1 answer
469 views

Proof of a trigonometric inequality

7 votes
1 answer
169 views

$f(x)=\displaystyle \sum\limits_{n=0}^{\infty}(-1)^n\frac{x^n}{n!n!}$ decreasing?

6 votes
2 answers
9k views

An elementary way to show any bounded subset of $\Bbb{R}^k$ is totally bounded

6 votes
1 answer
370 views

$\displaystyle\lim_{n\to \infty} \sqrt[n]{x_n+y_n}$ is the maximum of the sequences' nth root limits

6 votes
1 answer
3k views

Order of an element in the factor group divides order or element

5 votes
2 answers
520 views

A question about a method that shows $\mathbb{R} $ not finite dimensional.

4 votes
1 answer
4k views

The relation between rational forms and Jordan forms.

4 votes
3 answers
3k views

Showing the boundary of the unit sphere is closed

4 votes
2 answers
3k views

Additive set function properties

3 votes
1 answer
179 views

Showing every $p$-subgroup of order $p^i$ is in a subgroup of order $p^{i+1}$

3 votes
1 answer
1k views

A linear operator always has a cyclic vector

3 votes
2 answers
430 views

Criterion for a group to be abelian

3 votes
2 answers
206 views

Concerning the proof of the Cantor–Bernstein theorem

3 votes
1 answer
1k views

An alternative method for a question in Baby Rudin chapter 1 exercise 16

3 votes
1 answer
146 views

$x_{n+1}=\frac{2x_n+3f(x_n)}{5}$ showing $f$ has a fixed point

3 votes
1 answer
2k views

A Question in Rudin PMA chapter 9

3 votes
1 answer
72 views

A sequence converging to zero but having a reciprical that does not got to $\infty$

3 votes
3 answers
100 views

Trouble with form of remainder of $\frac{1}{1+x}$

3 votes
2 answers
985 views

Convergence a.e and in norm implies convergence in $L^p$ for $0<p<1$

2 votes
1 answer
970 views

Another example of a connected but non path connected set

2 votes
2 answers
142 views

studying $\int^x_0\frac{1}{1+t^3}dt$

2 votes
1 answer
292 views

The characteristic polynomial of a polynomial in a matrix?

2 votes
2 answers
8k views

Linear Transformation of polynomials

2 votes
2 answers
985 views

The unity of a subdomain

2 votes
2 answers
205 views

A reason for writing $\mathfrak{c}=2^{\aleph_{0}}$

2 votes
1 answer
105 views

A question about a proof concerning sigma algebras of open sets and rectangles.