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Author user:1234
user:me (yours)
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body:"apples oranges"
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4
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One possibility: assign UpValues to symbols a and b and useDt instead: Clear[a, b, f, r1, r2] a /: Dt[a, c] := r1 b /: Dt[b, c] := r2 f[a_, b_] := a + b Then, Dt[f[a, b], c] (* r1 + r2 *) To see …
answered Nov 24 '15 by march