Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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DE MOTU
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CORPORUM</
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Corol.
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3. Et concurſus tangentis cujuſvis
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PM
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cum recta
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SN,
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quæ ab umbilico in ipſam perpendicularis eſt, incidit in rectam
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AN,
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quæ Parabolam tangit in vertice principali. </
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PROPOSITIO. XIII. PROBLEMA VIII.
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Moveatur corpus in perimetro Parabolæ: requiritur Lex vis centri
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petæ tendentis ad umbilicum hujus figuræ.
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>Maneat conſtructio Lemmatis, ſitque
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P
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corpus in perimetro Pa
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rabolæ, & a loco
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Q
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in quem corpus proxime movetur, age ipſi
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SP
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parallelam
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QR
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& perpendicularem
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QT,
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necnon
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Qv
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tangenti pa
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rallelam & occurrentem tum diametro
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YPG
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in
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v,
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tum diſtantiæ
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SP
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in
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x.
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Jam ob ſimilia triangula
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Pxv, SPM
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& æqualia unius
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latera
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SM, SP,
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æqualia ſunt alterius latera
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Px
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ſeu
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QR
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&
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Pv.
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Sed, ex Conicis, quadratum ordinatæ
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Qv
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æquale eſt rectangulo ſub
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latere recto & ſegmento diametri
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Pv,
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id eſt (per Lem. </
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<
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>XIII.) rectangu
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lo 4
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PSXPv,
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ſeu 4
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PSXQR
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; & punctis
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P
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&
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Q
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coeuntibus, ra
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tio
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Qv
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ad
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Qx
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per (per Corol. </
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>2 Lem. </
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<
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>VII.) fit ratio æqualitatis. </
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<
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>Er
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go
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Qxquad.
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eo
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in caſu, æquale
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eſt rectangu
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lo 4
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PSXQR.
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Eſt autem (ob
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ſimilia trian
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gula
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QxT,
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SPN)
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Qxq.
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ad
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QTq.
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ut
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<
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PSq.
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ad
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SNq.
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hoc eſt (per
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Corol. </
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<
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>1. Lem. </
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<
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>XIV.) ut
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PS
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ad
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SA,
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id eſt ut 4
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PSXQR
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ad 4
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SAXQR,
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& inde (per Prop. </
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>IX. Lib. </
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>v. </
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>Elem.)
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&
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4
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SAXQR
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æquantur. </
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>Ducantur hæc æqualia in (
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SPq./QR
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), & fiet
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(
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SPq.XQTq./QR
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) æquale
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SPq.X4SA:
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& propterea (per Corol. </
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<
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>1 & 5
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Prop. </
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<
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>VI.) vis centripeta eſt reciproce ut
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SPq.X4SA,
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id eſt, ob da
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tam 4
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SA,
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reciproce in duplicata ratione diſtantiæ
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SP. Q.E.I.
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