You're trolling, right ? Are you kidding ? "Poorly documented" ? I use most of them on a regular basis. I haven't had first hand exposure with only Black&Scholes': But I looked the thing up when I was a freshman as I was interested in stock prices, and was interested in Louis Bachelier, Brownian motion. The rest is well documented through the whole Engineering curriculum. There are a couple I haven't used in a while (Schrödinger's and relativity (hint: Who is Poincaré)).

These "single character variables" are known for whom they matter. You can't have brevity and delimiter-separated names. Equations taking a whole line (or more), good luck with that.

"Maths notation is great for brevity but fails utterly tests for readability and ease of comprehension".. Okay, clearly trolling.

Next thing you know, IEEE will hire Will.i.am or Apple fanboys as consultants to make things "beautiful".