Then we would just have a bunch of mathematicians wondering what some of the function names meant, since English isn't always definitive of obvious in definition (not to mention the non-English speakers who have to learn a combination of symbols instead of one).

All you're really doing is substituting something you're unfamiliar (or less familiar) with, common mathematics symbols, with something you specifically happen to be more familiar with (programming pseudocode).

It's really no different than someone looking at your pseudocode and saying "why can't they just write it in plain English?"