Abstract
The General Recursive Algebra and Differentiation Assistant (GRAD Assistant) now under development, is a LISP-based system which can perform symbolic algebraic manipulation and differentiation. It is designed to produce a simplified expression of the result of any, sequence of symbolic manipulations involving addition, multiplication, exponentiation, and their inverses, and differentiation. In particular, it will never over- look that an expression is in fact independent of a particular variable. It does these things without requiring any externally supplied "hints" about difficult expressions. It can read and write a Fortran-like infix notation. It has been used in connection with a heuristic ordinary-differential-equation-solving program and a program that performs calculations arising from Ricmannian geometry.
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