I sit corrected. It’s used as an arbitrary singular value within the proof, so for any always felt more appropriate.

Nope, it means “for any” as in no matter which one you choose it will be correct.

Any upsidedown A in the set of all real characters used in academia would immediately illicit mathematical memories.

əəəə… What do you mean? /j

He is. Just about anyone who works in computer vision based machine learning knows this man. He’s insane and I would hire him on the spot, but there’s no way a company I work for could afford what he’s worth.