Stack Exchange

Math Attack

Italy

I calculate formulas when I'm bored to pass the time.
(Ergo I may not be very linear in the type of questions)

top accounts reputation activity subscriptions

Top Questions

$\infty$-multifactorial: $\displaystyle z!_{(\infty)}:=\lim_{\alpha\to\infty}z!_{(\alpha)}$

real-analysis calculus sequences-and-series limits gamma-function asked Sep 18 at 21:44

math.stackexchange.com

Derivative as a matrix: $\mathbf{D}=\dfrac{\mathrm{d}}{\mathrm{d}x}$

linear-algebra matrices derivatives polynomials infinite-matrices asked Apr 27 at 1:11

math.stackexchange.com

Closed form of integral: $\displaystyle\int_{1}^{\infty}\frac{ax-b+1}{x^{\frac{1}{b}}}e^{-\frac{a}{b}x}\ln\left(ax-b+1\right)\mathrm{d}x$

probability integration statistics definite-integrals improper-integrals asked Apr 23 at 13:12

math.stackexchange.com

Taylor series of $\displaystyle x!_{(\infty)}=\prod_{j=1}^{\infty} j^{\text{sinc}(x-j)}$ - generalization of $\psi(z)$

calculus sequences-and-series polynomials recurrence-relations taylor-expansion asked Nov 13 at 21:48

math.stackexchange.com

Number of loops of a ball bouncing in a room with obstacles

combinatorics matrices geometry number-theory intuition asked Oct 23 at 10:42

math.stackexchange.com

Top Answers

Integral $\int_{0}^{1}\frac{\ln\left(x^2\right)}{\left(1+x^{2}\right)\left(\pi^{2}+\ln^{2}x\right)}dx$

math.stackexchange.com

Can you graph $y^{4}x^{3}+x^{4}-y=0$ without a computer?

math.stackexchange.com

Naïve definition of a measure on a fractal

math.stackexchange.com

Calculate the integral $\int\limits_{0}^{\infty }\frac{\ln x}{\sqrt[3]{x}(x+8)}dx$

math.stackexchange.com