Mathematics
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man_in_green_shirt

Apparently, this user prefers to keep an air of mystery about them.

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  • Member for 5 years, 4 months
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  • Last seen Nov 7 '18 at 17:29

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33 Why is the commutator defined differently for groups and rings? Jun 29 '15
10 How to formalise: There are no geniuses but Newton was a genius Jan 22 '17
8 Mathematical Operator to flip a vector Jun 26 '15
7 Probability of 'same lottery numbers drawn twice'? Jul 12 '15
7 Why can't the ratio test be used for geometric series? Sep 6 '17
6 Powers of a $2 \times 2$ matrix Jul 17 '15
6 Why is $\mathbb{Z}[1/p]$ the direct limit of $\mathbb{Z}\xrightarrow{p}\mathbb{Z}\xrightarrow{p}\mathbb{Z}\to…$? Dec 6 '15
5 Why is this not a well-defined $\Delta$-complex of the torus? Oct 21 '15
5 Integral where upper limit is a dot - meaning? Sep 26 '16
4 Is $(U \cap A \neq \emptyset) \Leftrightarrow (U \cap \overline{A} \neq \emptyset)$ only true in Hausdorff spaces? Sep 9 '15
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