On math, magic, and mathematical grimoires.. As I was “speedrun reading” about MathML days ago, I discovered an amazing digital library of mathematical functions. Boring, but why amazing? Take a look at this function and hover click on any of the variables to view the definition, and keep clicking on more variables for even more… definitions. That’s a legit library. See, now all of us can roleplay as mages and mathematicians on the Internet.