Retired professor (Lyon, France), still with some academic research activities. Having more free time now, I devote it to sharing knowledge, especially in mathematics and its links with computer science.
Some of my answers (a few of them recent) that can be of interest:
PICTURE: Roots of the partial sum of exp(z)
The highest power of 2 less than x
Solving a functional equation using group theory
Infinite product for the cardinal sine
A recurrent sequence involving Fibonacci sequence
Decreasing importance of determinants but...
Eigenvalues of permutation matrices
Relationship quaternions-complex numbers
Finite fields: polynomial factorization
Non commutative ring of order 125
Two parameterizations for quadrilaterals
Equilateral triangle in a triangle
Playing with areas in a 5 pointed star
Equation $SS_1-T^2=0$ of a cone tangent to a quadric
nD Simplex coordinates of vertices
EditorFeb 7, 2019
SupporterOct 3, 2016
AutobiographerMay 31, 2017
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