Funny stuff 3

In a dark, narrow alley, a function and a differential operator meet:
"Get out of my way - or I'll differentiate you till you're zero!"
"Try it - I'm e^x..."

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Same alley, same function, but a different operator:
"Get out of my way - or I'll differentiate you till you're zero!"
"Try it - I'm e^x..."
"Too bad... I'm d/dy."

P.S. cu asta am terminat cu chestiile funny.Uneori e nevoie de un pic de destindere in sesiune :)