17^ DE CRITERIIS INTEGRABIL. 



\dx*dy) — \dx'J V d x2 > ^ \d x^ 



^dx^dyJ' — ^dx^dy' \ d x^ ^' ' ^d x' 



_^(ddQl) yfd-P') 



^dxdyi ^^^d y' 



( 45^" N /df^ R^'\ _ (d dQi\ . (d±\ __ TS^ 



W'4>'^ — ^dxdy'"' \dxdyi^^^dx^ 

 _.(ddQ!!\ x^fd PS 



Id^*^ — U:^»^ ^dy-i^^dyl 



Poiro 

 II. o=:(,|^)=i|^9-a + 0-G4)+N 



/d_f_R:'\ , Cdd_QS __ (d_P'v 

 \'dxdy^l~^^<:txdy^ ^d y ' 



4-C4AQ1') 

 ^ '^ d j* ^ 



XV, ^— ^d^c^^jy*/ — ^dxdy^l \dxdy^l^\dxdy' ^dxJ^^^ 



( d^R"\ \ f d ^Qi '\ ( d P\ 



V djs '''' ^ dy ^ ^dj»'' 



^* ^'-(d^)--(T3^i-"^-d^^+^-d7*--^"-(d3^^+N 



Hi igitur quinqiie valores vltimi nihilo aequales 

 pofiti , praebebunt totidem criteria integrabil tatis 

 pro formula noftra \dxdy. Ceterum omnino 

 notaflTe meretur , omnibus liis aequationibus in vnam 

 fummam colledis inueniri : 



