Yesterday was one of those good days doing hard stuff, playing with Chebyshev polynomials, binary coefficients, factorials of half integers, and other fun. All in the interest of a pointless decision to (re)implement the general 𝚪 function using the Lanczos approximation, but totally worth it for the experience alone.

The internet, the good old internet, is a treasure trove for this kind of work, especially but not exclusively wikipedia@wikis.world.