Mathematics
Geoff Robinson's user avatar
Geoff Robinson's user avatar
Geoff Robinson's user avatar
Geoff Robinson
  • Member for 12 years, 5 months
  • Last seen more than a week ago
  • United Kingdom
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All Questions Answers
Score Newest
answer
94
Is it true that $0.999999999\ldots=1$?
May 18, 2014
answer
61
The identity cannot be a commutator in a Banach algebra?
Jul 29, 2011
answer
54
Why is the complex number $z=a+bi$ equivalent to the matrix form $\left(\begin{smallmatrix}a &-b\\b&a\end{smallmatrix}\right)$
Aug 9, 2012
answer
31
How to prove that $\mathbb{Q}[\sqrt{p_1}, \sqrt{p_2}, \ldots,\sqrt{p_n} ] = \mathbb{Q}[\sqrt{p_1}+ \sqrt{p_2}+\cdots + \sqrt{p_n}]$, for $p_i$ prime?
Dec 22, 2011
answer
25
proper subgroups of finite p-groups are properly contained in the normalizer
Jul 10, 2012
answer
23
How is a group made up of simple groups?
Aug 6, 2011
answer
22
Upper bounds on the size of $\operatorname{Aut}(G)$
Feb 13, 2012
answer
20
Matrices which are both unitary and Hermitian
Aug 13, 2011
answer
20
subgroup generated by two subgroups
Jul 29, 2011
answer
19
If $\sum_{n=1}^{\infty} a_n^{2}$ converges, then so does $\sum_{n=1}^{\infty} \frac {a_n}{n}$
Feb 23, 2012
Top network posts
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66
Why can't a nonabelian group be 75% abelian?
43
How large can the smallest generating set of a group $G$ of order $n$ be?
41
Does a finite simple group of order divisible by $60$ have $A_{5}$ as a subgroup?
36
Determinant of sum of positive definite matrices
36
Properties to have matrices that commute in $\mathrm{GL}_n(\mathbb C)$

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