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Arnaud Mortier

https://sites.google.com/site/mortier2x0/home

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Top Questions
Top Answers
87
Why does adding a suitable multiple of $9$ always lead to the reverse of the number?
math.stackexchange.com

33
Why are fractions the same as divisions?
math.stackexchange.com

29
What makes radians superior to turns/revolutions?
math.stackexchange.com

22
Basic Probability Help for First Year Teacher
math.stackexchange.com

19
Where did I make a mistake in my simplification of the algebraic expression?
math.stackexchange.com

19
Without using a calculator, is $\sqrt[8]{8!}$ or $\sqrt[9]{9!}$ greater?
math.stackexchange.com

19
Is there a formal term for the placement of two symbols next to each other to imply an operation?
math.stackexchange.com

19
Go Pregnant or Go Home
puzzling.stackexchange.com

18
Why is there a pattern to the last digits of square numbers?
math.stackexchange.com

17
Why do these days of the week line up?
math.stackexchange.com

17
France's Public Holidays' Puzzle
puzzling.stackexchange.com

15
Move fast … Or you will lose
puzzling.stackexchange.com

14
Can the product of infinitely many elements from $\mathbb Q$ be irrational?
math.stackexchange.com

13
Spencer's “six standard deviations” theorem - better constants?
mathoverflow.net

12
How do you correctly reason that this directed graph is acyclic?
math.stackexchange.com

12
Why is it important for a matrix to be square?
math.stackexchange.com

11
Who is at the mall?
puzzling.stackexchange.com

11
What day is it again?
puzzling.stackexchange.com

11
My Sixteen Friendly Students
puzzling.stackexchange.com

11
Number of elements in the set $A=\{x\in\mathbb{R}|f(x)=1\}$.
math.stackexchange.com

11
Cool riddle involving integer vectors
math.stackexchange.com

10
Is mathematics just a bunch of nested empty sets?
math.stackexchange.com

10
Is probability determined by perspective?
math.stackexchange.com

10
$f$ is a real valued function. $f$ is differentiable at a point. Does that imply $f$ is continuous in a neighbourhood of $a$?
math.stackexchange.com

9
How many total checkmates can you possibly make against the enemy king?
puzzling.stackexchange.com

9
Father and Son and Grandsons
puzzling.stackexchange.com

9
Deusovi - trapped!
puzzling.stackexchange.com

9
Can the boundaries of two pentagons intersect at $20$ points?
math.stackexchange.com

9
Function $g(x)$, such that $\int_{\mathbb{R}} f(g(x))dx = \int_{\mathbb{R}} f(x)dx$ for all $f\in L^1(\mathbb{R})$
math.stackexchange.com

9
How to find some monomial in the ideal $\langle x^2-y,y^2-x\rangle \subset \mathbb R[x,y]$?
math.stackexchange.com

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