What is your favourite Math function?

Pic is the function Si(x), the integral of sinx/x.

mine is the la place transform.
[math]
\int_{0-}^{\infty} f(t).e^{-st}.dt
[/math]

...

Equations? Or any other means to construct it on a computer? Thanks...

The classic!

>not liking the superior Fourier Tranform

usually through it's definition
/math /int /delta (x-x_0) f (x) dx = f (x_0)

Well, fuck me

No problem, happens to the best of us...

One can like both, matter of personal interest after all