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Pierre-Guy Plamondon
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Feb 11 '15
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24
$f(x) $ be the minimal polynomial of $a$ (algebraic element) over $\mathbb Q$ , let $b=f'(a) \in \mathbb Q(a)$ , then is $\mathbb Q(a)=\mathbb Q(b)$?
21
Proving that $\det(A) \ne 0$ if $a_{i,i} = 0$ and $a_{i,j} = \pm 1$ for $i \neq j$
16
Coordinate-Free Definition of Trace.
14
Number of ways to dissect a square into triangles of equal area
12
In what categories does the "classical" notion of function make sense?
10
Principal ideal rings that are not integral domains
9
The colimit of all finite-dimensional vector spaces

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