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derivatives of indexed variables
What am I missing? total derivative of unspecified y: In:= Dt[y,x] Out= Dt[y, x] But if we take the derivaitve of an undefined indexed variable it is assumed to be a constant.. In:= Dt[a,x] Out= 0 note however that the indexed symbol could easily represent a non-constant. In:= a=y; Dt[a,x] Out= Dt[y, x] clearly the trouble is that there is no distinction between an indexed symbol and a function evaluated at a fixed point.. Is there a workaround?