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What kind of derivative?... (18.20)

Taylor: I just decided to work on a derivative.

Douglas Mason: What kind of derivative?

Taylor: An homage to Vadim Linetsky.

Douglas Mason: Oh. You're in a 'path integral methods' sort of mood, are you?

Taylor: Would you like to help me?

Douglas Mason: You bet.

Vadim Linetsky is a Professor in the Industrial Engineering & Management Sciences department of Northwestern University. This one is about as obscure as it gets. Obviously he is a mathematician. Here’s his page.