RJF@MIT-MC 12/31/76 01:42:26
SOMETIMES DIFF(E,X,N) CAN BE REDUCED EVEN THOUGH N IS "SYMBOLIC".
BATCH(GENDIF,>,SHARE2)$ AND YOU CAN TRY, FOR EXAMPLE, 
DIFF(%E^(A*X),X,Q) BY USING GENDIFF RATHER THAN DIFF.  UNEVALUABLE 
ITEMS COME OUT QUOTED. SOME ITEMS ARE IN TERMS OF "GENFACT", FOR 
WHICH, SEE MANUAL.  COMMENTS AND SUGGESTIONS ARE SOLICITED.