**ningluo@acsu.buffalo.edu (Ning Luo)** (12/06/90)

I'd appreciate if any one can help me on this: I would like to define an algebraic expression of an operator. For example, a power series of differentiation operators is very useful. Is this possible in MACSYMA (or any other symbolic math programs)? Thanx. -- Luo, Ning 218 CCC Bldg Roswell Park Memorial Institute Buffalo, NY 14263 | ningluo@sun.acsu.buffalo.edu (APARNET)