DownLoude

That's just a C++ thing. You have to input stings and specify UTF-8. ```c++ "æøå" ``` will not work, but ```c++ u8"æøå" ``` will.

A function like $\mathrm{ndiff}(f, n, \mathrm{var})$ would be very nice and maybe also a $\mathrm{npdiff}$? Don't worry if that isn't possible though.

My current implementation is this: https://www.math3d.org/eH3Z4cvhT It works fine (though it is a little on the slow side). Unfortunately I'm not entirely sure how to implement $\frac{d^\ell}{{dx}^\ell}\(x^2-1\)^\ell$ without making $\ell$...

Here are some spherical harmonics I made with this https://www.math3d.org/7peENsvPR Doing it with surfaces instead of colourmaps is possible, just that I need to put it at really low res,...