Mathematics
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Jean Marie

Semi-retired professor (Lyon, France). Having more free time now, I devote it to sharing knowledge, especially in mathematics and its links with computer science.

Some of my answers that can be of interest:

In analysis:

Solving a functional equation using group theory

https://math.stackexchange.com/q/1693990

https://math.stackexchange.com/q/2114726

In linear algebra:

https://math.stackexchange.com/q/1788168

https://math.stackexchange.com/q/1917093

In abstract algebra:

https://math.stackexchange.com/q/2297857

https://math.stackexchange.com/q/2248671

In probability:

https://math.stackexchange.com/q/1979286

In geometry :

Geodesic triangle in a cone

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  • Lyon, France
  • Member for 4 years, 4 months
  • 10,043 profile views
  • Last seen 4 hours ago

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88 Why does Friedberg say that the role of the determinant is less central than in former times? Nov 4 '16
23 Is it possible to have a $3 \times 3$ matrix that is both orthogonal and skew-symmetric? Jan 17 '17
21 Fibonacci sequence and other metallic sequences emerged in the form of fractions Jun 14 '19
21 Are there mathematical concepts that exist in dimension $4$, but not in dimension $3$? Sep 4 '19
21 Find all functions $f$ such that $f(x)+f(\frac{1}{1-x})=x$ May 4 '17
21 Three bullets are shot in a sphere. What is the probabilty that all of them end up in the same hemisphere? Jun 6 '16
20 Find the determinant of $I + A$ Oct 16 '16
19 How is this matrix called, and does it have a purpose? Feb 29
19 Japanese theorem, in its extended form Jan 20 '18
18 What are the properties of eigenvalues of permutation matrices? Oct 16 '16
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