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3.- },.Z=_ («x-.)+^. ^. (ax-.)'+2:5 ^. («^-.)^+&c 



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/(a-fa':c+fl'V+a"V...+a(%H&c.)-"'=0 



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2.3...(A'V— r)x2.3.../cxm'^'+A"''' 



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x:7íí;xsp. 



a"^+ 



2.3.. .Ar 



(a +a':c+a'V+a"V...-l-aW a!*+&c.)-^=0 



[2.5...(n— AV— l)rx (n— A'h') 

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2.3... A V 

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