Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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pagenum
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DE MOTU
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CORPORUM</
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PROPOSITIO XCVII. PROBLEMA XLVII.
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Poſito quod ſinus incidentiæ in ſuperficiem aliquam ſit ad ſinum e
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mergentiæ in data ratione, quodQ.E.I.curvatio viæ corporum
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juxta ſuperficiem illam fiat in ſpatio breviſſimo, quod ut pun
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ctum conſiderari poſſit; determinare ſuperficiem quæ corpuſcula
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omnia de loco dato ſucceſſive manantia convergere faciat ad
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alium locum datum.
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<
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A
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locus a quo corpuſcula divergunt;
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B
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locus in quem con
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vergere debent;
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CDE
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curva linea quæ circa axem
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AB
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revoluta
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deſcribat ſuperficiem quæſitam;
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D, E
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curvæ illius puncta duo quæ
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vis; &
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EF, EG
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perpendicula in corporis vias
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AD, DB
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demiſſa. </
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Accedat punctum
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D
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ad punctum
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E
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; & lineæ
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DF
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qua
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AD
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au
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getur, ad lineam
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DG
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qua
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DB
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diminuitur, ratio ultima erit ea
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dem quæ ſinus incidentiæ ad ſinum emergentiæ. </
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<
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>Datur ergo ratio
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incrementi lineæ
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AD
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ad decrementum lineæ
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DB
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; & propterea
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ſi in axe
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AB
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ſumatur ubivis punctum
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C,
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per quod curva
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CDE
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tranſire debet, & capiatur ipſius
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AC
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incrementum
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CM,
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ad ipſius
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BC
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decrementum
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CN
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in data illa ratione; centriſque
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A, B,
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& in
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tervallis
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AM, BN
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deſcribantur circuli duo ſe mutuo ſecantes in
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D:
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punctum illud
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D
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tanget curvam quæſitam
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CDE,
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eandemque
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ubivis tangendo determinabit.
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<
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E. I.
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Corol.
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1. Faciendo autem ut punctum
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A
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vel
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B
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nunc abeat in in
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finitum, nunc migret ad alteras partes puncti
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C,
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habebuntur Fi
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guræ illæ omnes quas
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Carteſius
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in Optica & Geometria ad Refra
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ctiones expoſuit. </
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<
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Carteſius
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maximi
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fecerit & ſtudioſe celaverit, viſum fuit hac propoſitione expo
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nere. </
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