Ah, so we're getting into the chemistry and math jokes are we?
So two atoms are walking down the street, and one says, "Oh no, I think I've lost an electron!", to which the other says "Are you sure?" "Yes, I'm positive!"
Did you hear on the news about the chemist that fell into the esterification vat? He survived, but was left horribly butylated.
So e^x and a constant function are walking down the street. Suddenly they see a differential operator approaching. The constant function says "Oh crap, I'd better get out of here; that differential operator will reduce me to nothing!" So e^x says "Well, he won't bother me, I'm e^x." So e^x walks up nonchalantly to the differential operator and introduces himself: "Hi, I'm e^x.". The differential operator smiles and says, "Hi, I'm d/dy."
