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Naweed G. Seldon's user avatar
Naweed G. Seldon's user avatar
Naweed G. Seldon's user avatar
Naweed G. Seldon
  • Member for 6 years, 5 months
  • Last seen more than a week ago
  • Santa Cruz, CA, USA
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Trying to make abstraction tangible, at least for myself.

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8
To show that the contravariant $\text{Hom}$ functor is left-exact
8
Functoriality of associating to a group algebra $kG$ its center $Z(kG)$, where $G$ is finite
6
Determinant of a $2\times 2$ real matrix when an eigenvalue is given
5
To show that if all roots of an integer monic polynomial have norm 1, then they are roots of 1
5
Universal Property and Fibered Product