Multiple-Precision Arithmetic and the Exact Calculation of the 3-j, 6-j and 9-j Symbols Described in this paper is a system of general-purpose multiple-precision fixed-point routines and their use in subroutines which calculate exactly the quantum-mechanical 3-j, 6-j and 9-j symbols of large arguments. CACM November, 1964 Maer, R. M. Redlich, M. G. CA641103 JB March 9, 1978 4:13 PM 980 5 980 980 5 980 980 5 980