Jean Marie
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:
Analysis:
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
Linear algebra:
Decreasing importance of determinants but...
Eigenvalues of permutation matrices
Relationship quaternions-complex numbers
General Algebra:
Finite fields: polynomial factorization
Non commutative ring of order 125
Geometry:
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
Probability:
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Lyon, France
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Member for 5 years, 1 month
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35 profile views
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Last seen Feb 15 at 12:23
Communities (15)
Top network posts
- 95 Why does Friedberg say that the role of the determinant is less central than in former times?
- 32 Find all functions $f$ such that $f(x)+f(\frac{1}{1-x})=x$
- 25 What are the properties of eigenvalues of permutation matrices?
- 24 Is it possible to have a $3 \times 3$ matrix that is both orthogonal and skew-symmetric?
- 22 Are there mathematical concepts that exist in dimension $4$, but not in dimension $3$?
- 22 Fibonacci sequence and other metallic sequences emerged in the form of fractions
- 20 Japanese theorem, in its extended form
- View more network posts →
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Feb 7 '19
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Oct 3 '16
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May 31 '17