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Good tip in general. Symbolic differentiation was McCarthy's motivation in 1960. My own motivation was nothing more sophisticated than "I wonder how much Haskell can look like M-expressions, without resorting to Template Haskell?"

neat code golf reason! :)

btw, I've been to some of the recent LispNYC events, have you been to recent ones?

I live about two hours away, more by public transport, and don't get in to the city much. I'll try to make a meeting in 2013...

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