Loreno Heer's user avatar
Loreno Heer's user avatar
Loreno Heer's user avatar
Loreno Heer
  • Member for 10 years, 6 months
  • Last seen more than a month ago
37 votes

Open mathematical questions for which we really, really have no idea what the answer is

15 votes
Accepted

Can someone explain why $x^{\log(a)} = a^{\log(x)}$?

12 votes
Accepted

Are $\emptyset$ and $X$ closed, open or clopen?

7 votes
Accepted

Is it true that $\lim_{x \to 0} \frac{f(x)}{g(x)} = 0 \implies \lim_{x \to 0} \frac{f'(x)}{g'(x)} = 0$?

6 votes
Accepted

Converse of the theorem "If a real number $c$ is constructible, then $c$ is algebraic of degree a power of 2 over the field $\mathbb{Q}$ of rationals"

6 votes

How to find a general sum formula for the series: 5+55+555+5555+.....?

6 votes
Accepted

Proving $(\mathbb{C},\mathbb{C})$ Is Not A Field

5 votes

What are some equivalent statements of (strong) Goldbach Conjecture?

5 votes

Real Analysis : Self Studying vs Doing a Course

5 votes
Accepted

Difficult sequence puzzle

4 votes
Accepted

Set Notation with exponent

4 votes

making a sequence of numbers in octave and matlab

4 votes
Accepted

Why $t^5-5t^4+10t^3-8t^2+2t$ can't be a chromatic polynomial.

4 votes

finding an acyclic but not contractible space

4 votes
Accepted

Open set of Polish space is again a Polish space?

3 votes
Accepted

Find all the substrings of the string $aabaabb$

3 votes

Can we find the inverse for a vector?

3 votes
Accepted

Weak Convergence and Weak Topology

3 votes

Who are some blind or otherwise disabled mathematicians who have made important contributions to mathematics?

3 votes

Make all the sixes. Fun

3 votes

What are some advanced books on metric space?

3 votes
Accepted

How do you factor $3x^{3/2} -9x^{1/2}+6x^{-1/2}$?

3 votes

Is the integer $0$ a deficient number?

3 votes
Accepted

Calculation of determinant of an arrowhead matrix

3 votes

Expressing a complex function in terms of z

3 votes

Prove that any power of a prime is not a perfect number

2 votes

Surprising applications of topology

2 votes

Is there any difference between 'all real numbers' and '$(-\infty, \infty)$'

2 votes

Mathematical pre-requisites to read History of Topology by I. M. James

2 votes

Recommended order of completion?

1
2 3 4 5