Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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DE MOTU
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CORPORUM</
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PROPOSITIO X. PROBLEMA. V.
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Gyretur corpus in Ellipſi: requiritur lex vis centripetæ tendentis ad
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centrum Ellipſeos.
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<
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>Sunto
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CA, CB
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ſemiaxes Ellipſeos;
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GP, DK
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diametri conju
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gatæ;
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PF, Qt
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perpendicula ad diametros;
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Qv
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ordinatim appli
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cata ad diametrum
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GP
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; & ſi compleatur
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parallelogrammum
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QvPR,
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erit (ex CoNI
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cis)
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PvG
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ad
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Qv quad.
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ut
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PC quad.
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ad
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CD
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quad.
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& (ob ſimilia
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triangula
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Qvt, PCF
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)
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Qv quad.
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eſt ad
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Qt
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quad.
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ut
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PC quad.
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ad
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PF quad.
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& conjun
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ctis rationibus,
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PvG
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ad
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Qt quad.
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ut
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PC
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quad.
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ad
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CD quad.
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&
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PC quad.
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ad
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PF
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quad.
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id eſt,
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vG
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ad
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(
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Qt quad./Pv
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) ut
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PC quad.
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ad (
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CDqXPFq/PCq
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). Scribe
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QR
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pro
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Pv,
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& (per Lemma XII.)
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BCXCA
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pro
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CDXPF,
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nec non, punctis
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P
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&
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Q
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coeuntibus, 2
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PC
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pro
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vG,
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& ductis extremis & mediis in ſe mutuo, fiet (
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Qt quad.XPCq/QR
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)
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æquale (2
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BCqXCAq/PC
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). Eſt ergo (per Corol. </
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<
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>VI.) vis centri
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peta reciproce ut (2
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BCqXGAq;/PC
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) id eſt (ob datum 2
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BCqXCAq
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)
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reciproce ut (1/
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PC
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); hoc eſt, directe ut diſtantia
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PC.
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E. I.
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Idem aliter.
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<
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PG
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ab altera parte puncti
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t
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poſita intelligatur
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tu
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æqualis ipſi
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tv
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; deinde cape
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uV
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quæ ſit ad
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vG
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ut eſt
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DC quad.
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ad
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PC quad.
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Et quoniam ex Conicis est
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Qv quad.
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ad
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PvG,
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ut
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DC quad.
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ad
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PC quad:
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erit
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Qv quad.
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æquale
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PvXuV.
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Unde quadratum chor-</
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