## Download APL with a mathematical accent by C.A. Reiter, W.R. Jones PDF

By C.A. Reiter, W.R. Jones

This booklet will be of curiosity to arithmetic scientists operating within the parts of linear algebra, summary algebra, quantity conception, numerical research, operations study and mathematical modelling

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Example text

A) The function A grows faster than any one-argument primitive recursive function, hence it cannot be primitive recursive. A b) Some small values of have bsen obtained (for example, i ( 1 ) = d.. "3, where power 2 appears 7 3, A(2) = 7, A(3) = 2'&3 = 61, 2 times). 0. c) Each A,,+1 grows more rapidly than A,,, since the former cannot be reached from the latter without the aid of itself. Nevertheless, all A,, are primitive recursive in contrast to A which cannot be primitive recursive. Returning to the PARIS-HARRINGTON example we can see that the functions R i and 2 have roughly the same rate of growth.

The codification scheme J is often called the CANTOR numbering and the number J(z,y) is referred to a8 the CANTOR number associated to the pair ( 2 , ~ ) . 34 Remark. Caludc The primitive recursive function "1 is also a pairing function. 8) Proposition. If r : p + N is a pairing function, then from the equalities u l ( z ) = u l ( z ' )and u 2 ( z ) = c2(z')we infer z = 2'. Proof. We have: z = 7r(u1(2),u~(2)) = a(ul(z'),u2(i)) = 2'. 0 Proposition. Let a : N --c N be a pairing function and E {ul,u2}.

In the opposite case we use again the auxiliary function f Let k be the smallest natural number for which g k ( a )= 0 , and deflne f by cases as follows: . (z+l) = g ( f - ( z ) ) . s -- a 5 5 G, * * * is The increasing sequence of classes G I G1 'z called the ACKERMANN-PETER hierarchy. The main results concerning the classes G , are due t o GEORGIEVA [1978a]. PAS) Theorem. (PETER [1957)) The diagonal function A ( z ) = A ( z , z ) is not primitive recursive. A:N - RV, 21 Chapter 1 Proof. h u m e , for the sake of contradiction, that 2 ia primitive recuris in G,.