Jean-Sébastien
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 Mar17 comment Where do summation formulas come from? Finite calculus is one way of computing sums cs.purdue.edu/homes/dgleich/publications/… Feb26 comment Investigate the convergence of $\int_0^\infty (-1)^\left[{x^2}\right] \, dx$ @AlonAlon because $[x^2]$ is an integer. Feb26 answered Problem with evaluating the exact value of an integral Dec20 awarded Constituent Dec8 awarded Caucus Nov18 comment Are the equations $2x - 2y = 11, x = y - 2$ unsolvable? This is most likely what was expected from the teacher Oct5 comment What is meant by“…on se ramène par régularisation…”? Careful, "Dénombrable à l'infini" does not mean countably infinite. It is rather linked with a locally compact spaces. I think it means that the space can be written has a countabble compacts family Oct5 reviewed Looks OK Let $n$ be an integer. Prove that if $2|n$ and $3|n$, then $6|n$ Oct5 reviewed Looks OK Let $n$ be an integer. Prove that if $2|n$ and $3|n$, then $6|n$ Oct5 reviewed Looks OK Summation of polynomial expression Oct5 awarded Custodian Sep30 awarded Explainer Sep23 comment Why is the polynomial $f(x)=x^3+x^2+x+1$ monotonic? You can upvote all relevant, and accept (and also upvote) the one that suits you best Sep22 comment Prove that $f(x)=x^4+8x^3+x^2+2x+5$ is irreducible in $\mathbb Q[x]$ Do you know the rational root test? Aug8 revised How many $4$ digit even numbers have all $4$ digits distinct? added 1 character in body Jul2 awarded Curious Jul1 answered If $X$ is distributed normally with mean $0$, is it correct to say $X$ and $-X$ “have the same distribution”? May15 awarded Yearling May10 answered How find a example such this set condition? May2 comment Calculating this integral: $I=\int_{0}^{\infty}(\log t)\,(\tan^2t)\,\mathrm{d}t$ You have bounds $0$ and $\infty$ in the title but some other numbers in the body, which is it?