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163<br />

a equação proposta, quo suppomos admittir um integral geral<br />

F (x, y, c) = 0, e seja y uma funcção de x e y. A<br />

equação<br />

(5) z [F<br />

dy dx<br />

dx<br />

9 («. y)<br />

«K*. y)<br />

3F<br />

íx<br />

3<br />

*F<br />

>y<br />

3F DF<br />

tx ty<br />

? («, y) ♦ ( x > y) '<br />

Logo, chamando z o valor commum das duas fracções anteriores,<br />

temos as igualdades<br />

das quaes se deduz<br />

L « x i (x, y), ­^­ — z 4» («, y),<br />

* [(¢, y) dx +

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