AD in a tweet: Implement complex number type with i^2=-1. Modify so i^2=0. Overload +, * etc. Now look at imaginary part of f(x+i).
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@TimSweeneyEpic I think the "real" hyperreals can't have simultaneously computable + and * so I use the low budget type I tweeted.Thanks. Twitter will use this to make your timeline better. UndoUndo
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