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)..."

"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."

"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."

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