Mathematics
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Rolf Hoyer
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All Questions Answers
Score Newest
answer
60
$\exists$ a non-compact space in which every proper open subset is compact?
Dec 5, 2017
answer
33
Only 12 polynomials exist with given properties
Apr 18, 2015
answer
17
$n^2+np$ is a perfect square
Mar 30, 2017
answer
16
If $\lim_{x\to0} f(x)+g(x)$ and $\lim_{x\to0} f(x)g(x)$ exist simultaneously, are there any $f(x)$ and $g(x)$ that do not have limit
Apr 4, 2015
answer
15
How to Determine a Power Series Represents an Exponential Function
Mar 30, 2017
answer
14
Find the sum of the infinite series $\sum n(n+1)/n!$
May 17, 2016
answer
13
Is $4$ the only power of $2$ with a ternary representation consisting of only odd digits?
Apr 14, 2015
answer
11
Galois group of $x^4-2$
Apr 12, 2015
answer
11
If every element of G/H has finite order and every element of H has finite order, then every element of G has finite order
Apr 11, 2015
answer
11
homotopic maps?
May 8, 2015

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