Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1ut ((bb/a4)/(bb/a3)√1+(mm/nn)-(2mbb/naa)+(b4/a4)) ſeu (1/√aa+(mm/nn)aa-(2mbb/n)+(b4/aa)) id
eſt, ſi in VZſumatur VYæqualis VG,ut (1/XY). Namque aa&
(mm/nn)aa-(2mbb/n)+(b4/aa)ſunt ipſarum XZ& ZYquadrata. Reſiſten­
tia autem invenitur in ratione ad gravitatem quam habet 3 XYad
155[Figure 155]
2YG& velocitas ea eſt quacum corpus in Parabola pergeret verti­
cem G,diametrum DG,& latus rectum (XYquad./VG) habente. Pona­
tur itaque quod Medii denſitates in locis ſingulis Gſint reciproce
ut diſtantiæ XY,quodque reſiſtentia in loco aliquo Gſit ad gra­
vitatem ut 3XYad 2YG; & corpus de loco A,juſta cum veloci­
tate emiſſum, deſcribet Hyperbolam illam AGK. Q.E.I.
DE MOTU
CORPORUM
Exempl.4. Ponatur indefinite, quod linea AGKHyperbola ſit,
centro XAſymptotis MX, NXea lege deſcripta, ut conſtructo
rectangulo XZDNcujus latus ZDſecet Hyperbolam in G&

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