[NohatCoder]

What really bothers me is that mathematicians seemingly never distinguish between doing and presenting mathematics.

You can do your own scribbles with single letters, so do I, it works fine.

But when you present maths in a scientific article, maths book, Wikipedia article or similar, your convenience as a writer should be secondary. Your task is to present information to someone who does not already know the subject. Presenting an equation as six different Greek letters mashed together means that the equation itself convey almost no information. You need a wall of text to make sense of it anyway.

[aaaaaaaaaaab]

Uh oh. I see you didn’t yet encounter the Einstein-notation for tensors :-)