->|3| ) 185 ( lf€<- 

 quae ad hanc f^rmam reducitur: 



1>tdi>'-^P'd.f-2pqdp dq -2{p'-q'){-^-\-^ + -^)~m' U\ (M) j 



ab hac aequatione fubtrahatur aequatio (N) eritque: 



{p^i^b^^iq^^ — i bqdpiq __ _ 2_A / ^ ^ _|_ ^» ^ 



_ il{q- ^bq^-^-^ib^ + q')- ^bTi -m'a\0), 



lam quia eft 



v"" ziz p^ -\- i. b q -\- b- \ u" — p^— 2.b q -\-b^\ 



confequimur 



v^ -^-W — z {p*'{-b*)\ v^~ u^ — ^bq\ 



tumque ob 



vdv-jizpdp-^-bdq; udu~pdp—bdq erit 

 V u dv d uzzip^ dp^ — b^ d q\ et 



v^ u'dv du — v u {p^ dp' - b' d q')\ 

 V' u'{dv'-\-du')-{v^\-if){p' dp^+bUq-] - 2 {v'-u')bpdpdq 

 - 2 (p' 4- ^^) (p^ «'p^ + ^' ^^'-) +%b'pq dp dq 

 z:2{p'-\-b'){p'dp'-b'dq') + 4.{p'+b')b'dq' 

 — Sb^pqdpdq. ' 

 Hinc igitur elicitur: 



^illil^iif - :^Liii^fLr:^2l) - 2 A « ( p' + ^ t^) + 2 B -y (/)'- ^ ^) 



^'l^{p'-\-b') + 2bDvu', 



4r- — d-T* "* rfT' 



=^~{r-^bq)ip^-\-b^-)-\-^-^{r-bq){p^-\-b^) 



Acia Acad. Imp. Sc. lom. VLP,h A a H- 



