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1. Introduction. From the purely computational point of view we are considering a real positive function S2 = f(Rx, Rî , Sx) defined (in (3.15) below) for values Rx , R2, and Si varying on a parallelopiped. The function / is composed of a large and undetermined number (possibly thousands!) of analytic pieces. The object is to find the minimum of / and to estimate ¿he number of pieces which constitute /. What we do is probably the easiest thing: We subdivide the parallelopiped by a regulardoi:10.1090/s0025-5718-1965-0195818-4 fatcat:ftvddawepfg3zkvul5pyyx2wcq