Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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tes
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TR,
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vel plura puncta
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P,
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devenietur ſemper ad lineas totidem
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YH,
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vel
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PH,
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a dictis punctis
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Y
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vel
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P
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ad umbilicum
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H
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ductas, quæ vel
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æquantur axibus, vel datis longitu
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dinibus
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SP
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differunt ab iiſdem, at
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que adeo quæ vel æquantur ſibi invi
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cem, vel datas habent differentias; &
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inde, per Lemma ſuperius, datur umbi
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licus ille alter
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H.
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Habitis autem um
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bilicis una cum axis longitudine (quæ
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vel eſt
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YH
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; vel, ſi Trajectoria Ellipſis eſt,
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PH+SP
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; ſin Hy
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perbola,
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PH-SP
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) habetur Trajectoria.
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Q.E.I.
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LIBER
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PRIMUS.</
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Scholium.
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<
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>Caſus ubi dantur tria puncta ſic ſolvitur expeditius. </
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<
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>Dentur
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puncta
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B, C, D.
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Junctas
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BC, CD
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produc ad
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E, F,
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ut ſit
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EB
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ad
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EC
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ut
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SB
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ad
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SC,
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&
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FC
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ad
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FD
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ut
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SC
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ad
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SD.
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Ad
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EF
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ductam
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& productam demitte normales
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SG, BH,
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inque
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GS
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infinite
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producta cape
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GA
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ad
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AS
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&
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Ga
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ad
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aS
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ut eſt
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HB
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ad
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BS
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; & erit
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A
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vertex, &
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Aa
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axis principalis Trajectoriæ: quæ, perinde ut
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GA
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major, æqualis, vel minor fuerit quam
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AS,
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erit Ellipſis, Parabola
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vel Hyperbola; pun
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cto
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a
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in primo caſu
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cadente ad eandem
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partem lineæ
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GF
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cum puncto
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A
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; in
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ſecundo caſu abeunte
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in infinitum; in tertio
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cadente ad contrari
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am partem lineæ
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GF.
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Nam ſi demittantur
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ad
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GF
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perpendicula
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CI, DK
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; erit
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IC
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ad
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HB
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ut
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EC
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ad
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EB,
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hoc eſt, ut
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SC
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ad
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SB
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; & vi
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ciſſim
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IC
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ad
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SC
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ut
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HB
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ad
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SB
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ſive ut
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GA
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ad
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SA.
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Et ſimili argumento
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probabitur eſſe
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KD
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ad
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SD
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in eadem ratione. </
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<
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B,
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C, D
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in Coniſectione circa umbilicum
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S
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ita deſcripta, ut rectæ omnes
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ab umbilico
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S
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ad ſingula Sectionis puncta ductæ, ſint ad perpendicula
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a punctis iiſdem ad rectam
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GF
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demiſſa in data illa ratione. </
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<
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>Methodo haud multum diſſimili hujus problematis ſolutionem
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tradit Clariſſimus Geometra
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de la Hire,
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Conieorum ſuorum Lib. </
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VIII. Prop. XXV. </
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