l't^ f t^ . . \'u = max t

3'. \^ueu.oA^u = mmu. , /

5. l'iA = 00 . = : m £ q . Ow . t^ '^ («^ -+- Q) - == A . Def. 5'é l^i^= — 00. = : m£q, Om. w^(m — Q)- = A. Def.

6'. J^i^£qv^((— oo).

7. a£q.o.a-i-oo :=oo-4-a = oo.a — oo = (— ■oo)-i-a= — oo . 00-4-60 = 00 .

— 00 — 00 = — 00. — oo<a<-+-oo% — oo<-+-oo, Def,

8. afQ.o.aXoo = <x»X^= ^ • <*X( — '^)=( — Q^)X^ ==^- ^ • QC)X<» = 0^ •

; ( — a>)X( — oo)=oo . ooX(' — ^)=T=( — <»)X°^ == — ^ • a/oo = û/(— qo) = 0. a/0 = + 00. Def.