Mathematics
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fgrieu

I'm an engineer by formation, with experience in applied cryptography, in particular in Smart Card systems. My current professional work is in contactless payment of public transport.

Feel free to edit my answers to fix obvious errors, or improve them on expression (I'm not a native English speaker).

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Top posts (40) All Questions Answers | Votes Newest

7 Find the area of quadrilateral formed by $4$ (not consecutive) vertices of a $12$-gon inscribed in a circle. Apr 5 '14
6 Do $n=2m+1$ and $\big(2^m\bmod(m\cdot n)\big)\in\{n+1,3n-1\}$ imply $n$ prime? Mar 2 '18
6 A concise distance problem May 6 '13
6 Decrease of entropy when iterating a random discrete function Mar 20 '14
5 Solving $x^e\equiv a\pmod n$ Mar 3 '14
5 On integer solutions to $a^3+b^3+c^3+d^3=3$ Feb 12 '18
4 Period of $i\mapsto S_0\,x^i\bmod P$ Jul 14 '18
4 $A,B,C,D$ on a circle. $\widehat{BAC}=\widehat{BDC}$ Feb 4
4 Probabilities maximizing a graph's “guaranteed yield” Jul 18 '16
4 Period for a Rubik's cube repeated manipulation May 13 '17
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