Top network posts

• 23 $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 $i \neq j$
• 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?
• 9 The colimit of all finite-dimensional vector spaces
• 9 Coordinate-Free Definition of Trace.
• 8 Abelian groups injective over their endomorphism
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