I was looking at “novelty ties” (long story) and found this one:
And as much as I’d love to have a tie with all sorts of equations on it, I just couldn’t bring myself to buy this one. I mean, look at all the bad math on it! Squared logarithms! Improper integrals! Weird notations! It’s like whoever designed this thing was flipping through a calculus book but didn’t really know anything about it.
Pity.