pa = Ur[l — l/(Np o a/N)r

23. ^ . : a? £ [min (N^;»7(a«^ — 1 s N&))]XN . = . a*' — l &N&

24. a £ 6 — N . D(a, b) = D(&, c) = 1 . o . N^^(rest {acP'^ b)=a) î=

[min (N^^(ôy — 1 £ Ne))] X N

Def.

(§ 2) { 1. n £ N . /-« GjZn+i . . Si»+Y= ^^f-h A»» ->- 1)

1. A — B = GoXi(A = B-f-X) (§ 4) { 2. A — B-+-C = (A — B)-i-C

4, A — B — C = (A — B) — C 11. AfG.o.lA = A

^^^M. 2. » TieN.o-. («-f-l)A = nA-i-A

m t 1. AjBêG.TO, »fN.o:A = — B. = .nA = mB

<§6) "" mm

[ 2. Af G . a £ R . m, 71 £ N . D(m, 7i) = l.a=»— .o.aA = — A ' n n

l 1. AfKG.XfG.o:X<rA. = .A-^(X-+-G)- = A ^^ ^M 2. » BfG,o::rA = B. = .-.X£G.Ox:X<l'A.=.X<B

1 1. A£G.a£KR.ra£Q.o.(ra)A = l'(aA) ^^ ^^1 2. » m£Q.o:mA= [l'(Rr^^(aî<m))}A

( 1. A, U £ G . . A/U=r { R o ^(w, na; f N . (?ia?)U <?iA.-=^a) } ^^ ^M 2. » . . r(A/U) = R r^cc7(n, Tiaj f N . (wa?)!! < nA.-=^A)

Pp.