I fail to understand the following behavior... it seems arbitrary to me...
How does Maxima decide that it won't evaluate a limit?
(C1) limit(exp(-1/x)/x^5,x,0,PLUS);
(D1) 0
(C2) limit(exp(-1/x)/x^6,x,0,PLUS);
- 1/x
%E
(D2) limit -------
x -> 0+ 6
x