I remember a maths class I had in first year uni, one of our lecturers was a guy from the maths department named Stu, or something like that. He is (or at least was in those days) an applied mathematician, and didn’t see a lot of point in pure mathematics. After a side note about how some property of vectors could be extended to n dimensions if you were into that sort of pure maths stuff, he set about justifying his point of view.

*“At the same time that Einstein was developing the theory of relativity, some joker was proving that anything multiplied by zero is really zero”*

The reason for this story is that while reading through some preliminary stuff on number theory I came across a proof that anything multiplied by zero is really zero.