The SCRATCHPAD system
James H. Griesmer, Richard D. Jenks · 1975
SCRATCHPAD is an experimental interactive for symbolic computation in use at the IBM Thomas son Research Center. SCRATCHPAD has facilities manipulation of multi-indexed variables and functions, and infinite sums, products, and sequences, and polynomials of arrays. Among the specific capabilities offered system are the following:Multiple-precision integer arithmeticRational number arithmeticPolynomial and rational function manipulationDifferentiationSymbolic integrationManipulation of formal power seriesSymbolic solution of systems of polynomial equationsTwo-dimensional output of mathematical expressions