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Dominic Michaelis's user avatar
Dominic Michaelis's user avatar
Dominic Michaelis's user avatar
Dominic Michaelis
  • Member for 11 years, 3 months
  • Last seen this week
332 votes
31 answers
39k views

Nice examples of groups which are not obviously groups

52 votes
3 answers
4k views

Is every function with the intermediate value property a derivative?

25 votes
1 answer
964 views

Showing a filter on the Power set of $\mathbb{Z}$ is a one point Filter

17 votes
2 answers
899 views

Does $\sin(x)=y$ have a solution in $\mathbb{Q}$ beside $x=y=0$

11 votes
2 answers
2k views

Whats the connection between functions with curl 0 and holomorphic functions

8 votes
2 answers
700 views

Topological way to show , if $X$ finite than there is no bijection to $X\setminus{x}$ while $x\in X$

8 votes
2 answers
2k views

Integrating $\frac{x^3}{\exp(x)-1}$ from $0$ to $\infty$

7 votes
2 answers
2k views

Examples of non-cyclic group with a cyclic automorphism group

7 votes
2 answers
400 views

What happens after the cardinality $\mathfrak{c}$?

7 votes
1 answer
924 views

Outer measure discontinuous from below

5 votes
0 answers
274 views

Weierstrass Product of $z\cos(z)-\sin(z)$

4 votes
1 answer
181 views

Is a $C^\infty $ function local monotone at a minimum?

4 votes
1 answer
212 views

Entire extension of a function on a set with an accumulation point

1 vote
1 answer
2k views

Laurent expansion with essential singularity

1 vote
1 answer
49 views

Hint for a combinatorial proof of $n! \binom{n-1}{k-1} = \sum_{j=0}^n \overline{s}_{n,j} \tilde{S}_{j,k}$