Here follows a transcript of a Maple 6 session on a PC:
My question is: what is wrong with the last statement?
It’s a bug, and still present in Maple 8. A work-around is
D[n] refers to nth argument, not nth derivative e.g.:
It looks to me like a bug arising from
Surely, by deﬁnition, it should deliver the result (D(f)@g)*D(g) when f is a function of one variable (as with exp in your case).
In addition, I see that the same error arises when the variables are explicitly shown in