Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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LIBER
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PRIMUS.</
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SECTIO IV.
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De Inventione Orbium Elliptieorum, Parabolieorum & Hyperbolico
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rum ex umbilico dato.
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LEMMA XV.
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Si ab Ellipſeos vel Hyperbolæ cujuſvis umbilicis duobus
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S, H,
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ad
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punctum quodvis tertium
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V
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inflectantur rectæ duæ
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SV, HV,
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quarum una
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HV
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æqualis ſit axi principali figuræ, altera
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SV
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a
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perpendiculo
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TR
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in ſe demiſſo bi-
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ſecetur in
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T;
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perpendiculum illud
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TR
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ſectionem Conicam alicubi tan
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get: & contra, ſi tangit, erit
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HV
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æqualis axi principali figuræ.
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<
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>Secet enim perpendiculum
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TR
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re
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ctam
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HV
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productam, ſi opus fuerit,
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in
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R
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; & jungatur
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SR.
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Ob æquales
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TS, TV,
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æquales erunt & rectæ
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SR, VR
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& anguli
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TRS, TRV.
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Unde punctum
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R
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erit ad Sectionem Conicam, & perpendiculum
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TR
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tanget eandem: & contra.
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Q.E.D.
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PROPOSITIO XVIII. PROBLEMA X.
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Datis umbilico & axibus principalibus deſcribere Trajectorias Ellipti
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cas & Hyperbolicas, quæ tranſibunt per puncta data, & rectas po
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ſitione datas contingent.
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<
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S
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communis umbilicus figurarum;
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AB
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longitudo axis prin
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cipalis Trajectoriæ cujuſvis;
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P
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punctum per quod Trajectoria de
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bet tranſire; &
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TR
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recta quam debet tangere. </
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<
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P
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inter
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vallo
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AB-SP,
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ſi orbita ſit Ellipſis, vel
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AB+SP,
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ſi ea ſit Hy
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perbola, deſcribatur circulus
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HG.
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Ad tangentem
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TR
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demittatur
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perpendiculum
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ST,
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& producatur idem ad
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V,
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ut ſit
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TV
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æqualis
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ST
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; centroque
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V
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& intervallo
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AB
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deſcribatur circulus
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FH.
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Hac </
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