vbi fi ftatuamus (A^)z=T, erit 



(^.) = (H) - P (H) - 9 (a-P ^ »• (H) ^ ^t^-- 

 vnde manifefto erit 



licque adepti fumus fequens theorema: 



St fuerit fVdx — Z^ tum femper erit 

 P ^ (a^) = (m- fi^' ^ ^ (.^.) = 5 • (a^)- 



J. 17. At ii fola jo variabilis capiatur, tum erit 

 r iiL ^ziir -^ )-+-nf _5iz_-)H-af .l!^\_f.r^_3iz_ W etc 



^dxdyf' 



Hinc ergo fi ponatur ( ^i^ ) =z T, erit 



hincque formatur fequens theorema: 



Si fuerit fVdx~Z^ tum femper erit 



p ^ (m^ = (m^ +p ^ (mh fi"^ 

 ^^(mi)-^^(m)=^-(iiT,)- 



J. 18. Sit nunc fola littera q variabilis, eritque 



^(lllA 

 hinc ergo ii ponatur {—^ ) ~ T^ erit 



hincque formatur fequens theorema: 



Si 



