Ewan Delanoy

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119 Answers

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13
Example of two dependent random variables that satisfy $E[f(X)f(Y)]=Ef(X)Ef(Y)$ for every $f$
10
what is the sum of this?$\frac12+ \frac13+\frac14+\frac15+\frac16 +\dots\frac{1}{2012}+\frac{1}{2013} $
8
Does $2x^2-1=y^5$ have a solution in integers, with $y>1$?
7
Exercise in Lang Algebra Ch 5
7
Continuous functions with a certain condition
7
Minimising the maximum distance between bounded functions for a given bounded function
7
When is a sum of consecutive squares equal to a square?
7
Countability of the zero set of a real polynomial
5
How did Letac solve $x_1^k + x_2^k + \dots +x_9^k = 0$ for $k = 1, 3, 5, 7$ in 1942?
5
What can we say about $(I-AD)^{-1}$ if $D$ is a diagonal matrix?
5
Sequence of solutions to $x\sin x=1$
5
A question about curves in $\mathbb{R}^2$
5
symplectic lie algebra is simple
4
Prove by using diagonalization
4
In how many ways we can arrange two strings with distinct elements such that the order is intact?
4
If $H\unlhd G$ with $(|H|,[G:H])=1$ then $H$ is the unique such subgroup in $G$.
4
Prove $\frac{a}{bc}+ \frac{b}{ca}+ \frac{c}{ab} \ge 1$
4
$f,g:\,(X,\mu)\to\mathbb{R}$, $f=g$ a.e then if $g$ is Lebesgue measurable then so if $f$?
3
Multiplication of determinants
3
Can we prove $\displaystyle \limsup_{n \to \infty} \sin(n) = 1$?
3
Prove a set in $\mathbb{R}^2$ is convex.
3
Finding the degree of a field extension over the rationals
3
A proof of Jacobsthal identities
3
If $K/F$ is a quadratic field extension, any generator of $F^*$ is a $|F|+1$ power of some generator of $K^*$? (From Ireland/Rosen)
3
Polynomial approximation of circle or ellipse
3
Showing that complicated mixed polynomial is always positive
3
A difficult symmetric inequality
3
Linear forms, “projections”, an inequality - French agregation
3
Isomorphism between centralizer and semi direct product
3
Finding Expressively Adequate truth Functions
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