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Dominik
  • Member for 9 years, 8 months
  • Last seen more than a month ago
31 votes

Infinitely number of primes in the form $4n+1$ proof

13 votes

Show that $e^x \geq (3/2) x^2$ for all non-negative $x$

10 votes
Accepted

Is $f(z)=\bar{z}$ continuous?

9 votes
Accepted

Can a sequence of functions have infinity as limit exactly at rationals?

9 votes
Accepted

Computing eigenvalues from characters

8 votes
Accepted

Asymptotic expansion of the integral $\int_2^x \frac{e^t}{t} dt$ for $x \to \infty$

7 votes

Showing that $1^k+2^k + \dots + n^k$ is divisible by $n(n+1)\over 2$

7 votes

Counterexamples in complex analysis

7 votes
Accepted

Is $ \pi $ definable in $(\Bbb R,0,1,+,×, <,\exp) $?

7 votes

Almost Topology

6 votes

Supremum of the log2 x for x belonging to the naturals - {0}?

6 votes
Accepted

$f(U)=U$ but $f$ is not injective.

5 votes

Using combinatorial argument prove that $\frac{(3n)!}{2^n\times 3^n}$ is an integer.

4 votes
Accepted

isomorphism $\Bbb Q$ to $\Bbb Q \cap (0,1)$

3 votes

Irrationals can be separable by finding a countable dense subset.

3 votes
Accepted

The kernel of a group action defined by left multiplication on left cosets of $H\leq G$

3 votes
Accepted

For what values of $\alpha$ does this integral converge?

3 votes
Accepted

Discriminant ideal in $\mathbb{Z}$

3 votes

"Probability" of Divisibility by Primes Proof

3 votes
Accepted

Limits Problem : $\lim_{n \to \infty}[(1+\frac{1}{n})(1+\frac{2}{n})\cdots(1+\frac{n}{n})]^{\frac{1}{n}}$ is equal to..

3 votes
Accepted

Show that all the zeros of $g$

2 votes
Accepted

How to prove $f'(a)=0$?

2 votes
Accepted

What is the maximum of a set of random variables?

2 votes

looking for a combinatorial interpretation

2 votes

What is being researched on the frontiers of math and what are the expected applications for it?

2 votes
Accepted

Meaning of no explicit time dependence

2 votes

Global maximum/ minimum of a function of more than one variable.

2 votes

How to determine oriented angle of rotation in 3-dimensional space

2 votes

K critical graphs connectivity and cut vertex

2 votes
Accepted

Jordan canonical form and rational canonical form for 10 x 10 matrix