MATHEMATICAL SECTION. 115 
Oy eet +c) 
ar Qn +1 bn 
V3 (a—3) 
1 2 Van 
aaa ee l VEG (sufficiently near) 
ey pee 
as - U Ete Para (sufficiently near) 
1 ? On : 
= 5 / aves (sufficiently near) (62) 
oo Cn 
therefore we have by (61) 
1 dat 1 2? an 
eee." ve 
Da Deltas 2 
ee 2 Bi L (—*) 
Cn 
2 == 2 —n+1 
1 (an zm)? "=1(2 a? i 
n—1 Cn—1 
: on 
since Cp = + (An_1 — D n_1) =7 
it, ae —n+1 — Be —n+2 
= 1 (2m . =)" =1(="=)" i 
if AS V Gx An—1 
=] (2 on an 1 Ga) ee 
i C n—3 Cn—3 
if a,» = V 4-1 An—2 
G, ¢, 
if a,= Ya, a, (63) 
2 <al 2 
a (2%, . =)? =1 (=) 
Cc Cc 
if=V aa, (64) 
