Why write out thousands of words when you can just define them with a single mathematical expression? This mathematician is playing 4D chess while the rest of us are playing Scrabble! The formula elegantly defines all possible words as sequences of alphabet letters with lengths from 1 to 45 (because apparently writing "pneumonoultramicroscopicsilicovolcanoconiosis" is where we draw the line). This is peak mathematical laziness - maximum output, minimum effort. The true definition of work smarter, not harder!
Next time your English teacher asks for a vocabulary list, just hand in this equation and watch their brain short-circuit. Mathematical efficiency at its finest!