Mathematics
Karl Kroningfeld's user avatar
Karl Kroningfeld's user avatar
Karl Kroningfeld's user avatar
Karl Kroningfeld
  • Member for 10 years, 6 months
  • Last seen more than a month ago
  • Königsberg, Germany
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Some graduate student.

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All Questions Answers
Score Newest
answer
25
Why is $\;n^2-\frac{n^2}{2} =\frac{n^2}{2}\;$?
May 3, 2013
answer
20
What are two continuous maps from $S^1$ to $S^1$ which are not homotopic?
Jun 5, 2013
answer
13
injection $\mathbb{N}\times\mathbb{N}\to\mathbb{N}$
Jul 24, 2013
answer
12
Induction without a base case
Jan 5, 2014
answer
11
Difference between basis and subbasis in a topology?
Jul 22, 2013
answer
10
Atiyah Macdonald – Exercise 2.15 (direct limit)
Jan 24, 2014
answer
10
Is $(\ln 2)^2$ transcendental?
Oct 7, 2018
answer
9
Prove that if for all $aba=bab$ then $|G|=1$.
Aug 16, 2013
answer
8
Give an example of a UFD having a subring which is not a UFD.
Dec 20, 2013
answer
8
On simple groups $G$, where $2\mid |G|$, $4\not\mid |G|$
Sep 9, 2013

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