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The original program was limited to tetration because subroutine recursiveness in Control Data 160 FORTRAN has been held down to four levels in the interests of economy. ... The order of the operation is given by op. For op = 1 addition is performed. For op = 2 multiplicaLion, repeated addition, is done. Beyond these the operations are non-commutative. ... CERTIFICATION OF ALGORITHM 66 INVRS (J. Caffrey, Comm. ...doi:10.1145/367766.368168 fatcat:p4ndsdwflvactos7mcden3q7aa