The guy gets on a bus and starts threatening everybody: “I’ll integrate you! I’ll differentiate you!!!” So everybody gets scared and runs away. Only one person stays. The guy comes up to him and says: “Aren’t you scared, I’ll integrate you, I’ll differentiate you!!!” And the other guy says; “No, I am not scared, I am e^x.”
A function and a differentiation operator meet somewhere in Hilbert space. The differentation operator: Make place or I differentiate you.
Function: Forget it buster, I am e^x.
The differentation operator: Well, I am d/dy.
“Doctor, Doctor, You’ve got to help me - I just can’t stop my hands shaking!”
“Do you drink a lot?”
“Not really - I spill most of it!”
“Doctor, doctor, will I be able to play the violin after the operation?”
“Yes, of course…”
“Great! I never could before!”
“Doctor, please hurry. My son swallowed a razor-blade.”
“Don’t panic, I’m coming immediately. Have you done anything yet ?”
“Yea, I shaved with the electric razor.”
