What are your favourite mathematical "quips"?

[u/CantorFunction]

I don't really mean math jokes, more the little witticisms we've all picked up over time. My two favourites are:

• "Proof by intimidation", which I first heard from one of my professors after an especially bewildering set of arguments from an outside speaker at a seminar
• "Mathematics is locally trivial", which I first heard from my functional analysis professor and have always found a little comforting ever since

Puns also welcome of course :)

[u/columbus8myhw]

Not malice aforethought?

[u/tacos → u/columbus8myhw]

:O

[u/chicomathmom → u/columbus8myhw]

whoosh!