vnde variabUitas folius q primo dabit: 



J. 2 8. QLiodfi iam hanc formam vlterins fecundum 

 dq differentiemus, perueniemus ad lianc aequationem: 



et denuo differentiando prodibit: 



Kdp^^dqy \dp^dq'J ^ \dydp^-'dqV 



haecque fufficiunt ad conftituendum fequens 



Theorema gcnerale 3. 



Si fuerit fJ^dx — Zj, tum femper erit: 



/ ^« + (3 + 7 + 5- Y \ / ^« + (5 + 7 + 5- 2 \ 



^^^ Kdx^df-^^Tp^-^dqy 



^^^^""Kdx^dfdpy-^dq^-)' 



J. 2p. 



