i8<J DE CRITERIIS INTEGRABILIT. 



aiii 



• 



itern pcr combinationem clicit.ie , vn.ca omninQ 

 hac fJirmuhi coinpreheiidi poflunt : 



- 5 (ii;)4- 4 (j4^-,) - 3 (:z^+ -- i^;^ - (;:;'j-,) 



de qua ccrte obferiiari mcretur , omnia mcmbra in 

 iisdem lineis fiuc horizontaUluis , fiue diagonalibus 

 coilocata , formulas pracbere euanerccntes. 



lo. Ex combinationc huius formulae cum illa 

 §. 3 3. Diflcrt. I. allata , (cqucntcs dcmum binae 

 erucntur acquationes , pro critcriis intcgrabilitatifi 

 furmulae \' d x dy 



1. P-^(''^)4-3(^-^)-4ff,f)+5(4J-) 



1x^1 ' ^W 



+ 3r^';-+(Sv+5;.^^) = <' 

 -4C^)+5(rJT.) 



+ 5l^-;|.-) 



