Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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Exempl.2. Ponamus vim centripetam eſſe ut altitudinis A dig­
nitas
quælibet An-3 ſeu (An/A3): ubi n-3 & nſignificant digNI­
tatum
indices quoſcunQ.E.I.tegros vel fractos, rationales vel irratio­
nales
, affirmativos vel negativos.
Numerator ille An ſeu —T-Xn
in
ſeriem indeterminatam per Methodum noſtram Serierum conver­
gentium
reducta, evadit Tn-nXTn-1+(nn-n/2)XXTn-2 &c.
Et
collatis hujus terminis cum terminis Numeratoris alterius
RGG-RFF
+TFF-FFX, fit RGG-RFF+TFF ad Tn
ut-FF
ad-nTn-1+(nn-n/2)XTn-2 &c. Et ſumendo ratio­
nes
ultimas ubi Orbes ad formam circularem accedunt, fit RGG
ad
Tn ut-FF ad-nTn-1, ſeu GG ad Tn-1 ut FF ad nTn-1,
& viciſſim GG ad FF ut Tn-1 ad nTn-1 id eſt ut 1 ad n;
adeoque
G ad F, id eſt angulus VCpad angulum VCP,

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