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Mirko
  • Member for 7 years, 9 months
  • Last seen more than a month ago
45 votes
Accepted

Interesting Question on Ants

14 votes

Prove that zero multiplied by zero is equal to zero.

14 votes

Tiling the plane with consecutive squares

11 votes

Is there an infinite topological space with only countably many continuous maps to itself?

11 votes

Nonobvious examples of metric spaces that do not work like $\mathbb{R}^n$

10 votes
Accepted

Next Term Of Strange Sequence

9 votes
Accepted

Twin Primes (continued research)

9 votes
Accepted

Lindelöf and second countable spaces

8 votes

Comparing infinitesimal sequences

8 votes

Proof: Is there a line in the xy plane that goes through only rational coordinates?

8 votes
Accepted

what is a fiber for function mapping?

8 votes

Continuous function from $(0, 1]$ onto $(0, 1)$?

8 votes
Accepted

Does every power of $2$ of the form $2^{6+10x}$, $x\in\mathbb{N}$, have $6$ as one of its digits?

8 votes

Mapping the open ball to itself?

7 votes

Example of continuous function $f:(\mathbb R $ \ $ \mathbb Q) \cap [0,1] \to \mathbb Q \cap [0,1] $

7 votes
Accepted

Continuous functions that attain local extrema at every point

6 votes
Accepted

In a metric space, is every open set the countable union of closed sets?

6 votes
Accepted

Is there always a stable position for a rectangular lawn table?

6 votes

Dense set in the unit circle- reference needed

6 votes

Alternative way to find if an infinite set is countable

6 votes
Accepted

Hausdorff spaces from filters

6 votes
Accepted

Does $a_n$ converges if and only if $a_{2n},a_{3n},a_{2n-1}$ converge?

6 votes

Proving divergence of a sequence by proving the sequence is increasing.

6 votes
Accepted

Last digits of sum $n!+m!$

5 votes

How to explain to a 14-year-old that $\sqrt{(-3)^2}$ isn't $-3$?

5 votes

Example of Hausdorff and Second Countable Space that is Not Metrizable

5 votes

Explanation of specific parts of Urysohn's Lemma proof

5 votes
Accepted

"Every open cover admits an open locally finite refinement" - can this refinement always be realized in terms of basis sets?

5 votes
Accepted

How to solve the functional equation $f(x+a)=f(x)+a$

5 votes
Accepted

Does the existence of the derivative at a point imply the existence of the left and right derivative?

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