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Arnaud D.

I did my PhD in mathematics at UCLouvain in Louvain-la-Neuve, Belgium, and am now a postdoc the Institute of Mathematics of the Czech Academy of Science in Prague. I am interested in algebra, especially universal algebra and category theory.

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86 Is there an intuitive reason for a certain operation to be associative? Feb 19 '18
30 Limit of sequence in which each term is defined by the average of preceding two terms May 11 '17
17 How to find a 3x3 matrix with determinant =0 from which I can delete random column and random row to make it nonzero? Jun 4 '17
12 Function with infinitely many right inverses? Jan 17 '16
12 Does every functor from Set to Set preserve products? Feb 27 '19
11 Can functoriality be explained in the opposite way? Mar 1 '20
11 When does equation $(A^TA)^n=I$ have solution? Mar 12 '18
11 Is the identity axiom in the definition of group action redundant? Aug 10 '18
11 Prove: $|a\sin x+b \cos x|\leq \sqrt{a^2+b^2}$ Jun 21 '16
11 If $\det(A^2)= \det(A)$, then $A^2 \in \{A, A^{-1}, -A, -A^{-1}\}$ Jul 4 '17
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