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whence 
530-6) 
Third Limitation of the Value oj 
531. From (526-4) we have 
531-1) 
and we can write 
(531-2) 
D+ 
so that we have 
331-3) 
() These results show that w has to be large enough for A to remain 
sufficiently small. This is the general result given in § 518 of the App- 
endix. It may be recalled th~t in all cas~ 
conditions (220-13) and 
(520 
Allais - pag. 253