— 129 — 



, ,~. f BdVx , 2K /33$'\ i L /33 <p\ , 2N /3$\ , P /3:p\ \ /3n\ 



'i l J (a)'i+F vdxay "*" f v^x» / "•" f v3 T / •" FVa*/Md^/ 



/K .,33$\ . 2L /33(J>\ , 3M / 33 $\ P ,3$_\ , ££L ,3__\ n ,3n'v 



*«" v? ^3> 2 / "^" f \ajcay «~ e W / » f vaj,/ "+" f \dx) ) \dx) 



_j_ ^ _^ _i_5 /__ &j\ _i_ i /__! ®l.\ . M / 9 _j_S _±_ _ r*-^ -*- p f_____} 



' ua^a / ~t~i.- V3y3x/ ' f Va^ 3xV ' f v ^x 3 /"" 1- f V'd>»/ • ~ va_-_y 



i a. /3*P'\ , R /3(p\ S ,3£\ \ rr/ __ _ . 



"+" F ('^ + F (~~V "+" 8 fe)) ^ — °> 

 fk fi®"\ . K ,d$"\\ /33n\ /2K,3(p'\ , 2L/3(p'\w33n\ , /L/3(p'\ 



w V"ay ~ 1 ~f Vdx // v _-~v -r VTva? / • f v_^//Hd„~ay-rv F V3;v/ 



+ f (!S) (1?) 



1 /o /W\ , |5 /W\ . L /3_31_\ , 2N /3__\ , P /W'\\ /d__\ 

 1" v \3>2 / i" F (3x3y ~r F V dx 2 / ~" t " F • 3> / ■" F V ^x // \ dy ' 



, /K /33$'\ , 2L /^'^ 1 3M / aa $'S 1 p / 9 $"\ 2 QL/'*P > ''\\ /3ii\ 



~r v~\ 3y / '+" f Uxdy "• f (__-■/ ~+~ f V3~T7+" F Ux // v^; 



4, //_____) _i_ 5 (_-_*i) + _ c d -V-\ + M r" r ) -4- * (**¥) 



• V V 3jx j / ^^ f Vajy^ a _/ -r t v^ ax 2 / T f ^a^^ r f \dy 2 > 

 ■4. _ (__*__) _i. £ (**___) _l. R (___-\ _. § f___S^ 11- i-t o 



^ ¥ \dxdy) 1 F \ dx* J ^ F \dy ) ^ ¥ \dx )) XX U ' 



[(3 (f ) + £ (*©) = (_fj (..) + (f (f ') + £ (£)) (O (?) 



+ (£) (af » + ^ + ?©) 2 ® ® + (3 (t) 



■+ ?m) n\^') + ftRf) + >(t9) n\S) 



, ,L ,3$'\ 3M /3P'\n TT //93<P\ /o/-a<J>"\ -K,33$'\ , ^,33$'^ 

 , 2N/3$"\ l'/^"u n //3$\ /K/33(p'\ 2L /33(p'\ 3M/33(p"x 



"+■ 7h^ + F(axii n bjri^ ( F -by )+ Y-ltety ^VV 3x^) 



+;^)+^)^(i?)_^=^ 



* ■"(? (f )^-t d&) n^(f) 2 4- (f (^) + 2 ^ (|9) nf d f) (|f j 



+ (^(f)+ 3 5 M (^))^(^^:^__,0. 



smleres equatiom foirrniront des equations de con- 

 trois;ej.ne ti.fermfn.era c : Cp', en suppgsant la coa- 



IVora __V*a Accd. Imp. Sc. T. XIII. _8 



Les deux pre 

 dition , et la 



