Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1
DE MOTU
CORPORUM
Cas.2. Agatur DQVabſcindens tum ſectoris DAV,tum tri­
anguli DAQparticulas quam minimas TDV& PDQ; & e­
runt hæ particulæ ad invicem ut DTQad DPqueid eſt (ſi TX
& APparallelæ ſint) ut DXquead DAquevel TXquead APque&
diviſim ut DXq-TXqad DAq-APqueSed ex natura
Hyperbolæ DXq-TXqeſt ADq,& per Hypotheſin APq
eſt ADXAK.Ergo particulæ ſunt ad invicem ut ADqad
152[Figure 152]
ADq-ADXAK; id eſt, ut ADad AD-AKſeu ACad CK:
ideoque ſectoris particula TDVeſt (PDQXAC/CK), atque adeo ob
datas AC& AD,ut (PQ/CK), id eſt, ut incrementum velocitatis
directe utque vis generans incrementum inverſe, atque adeo ut par­
ticula temporis incremento reſpondens.
Et componendo ſit ſum
ma particularum temporis, quibus omnes velocitatis APparticulæ

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