Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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LIBER
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PRIMUS.</
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PROPOSITIO XLI. PROBLEMA XXVIII.
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Poſita cujuſcunque generis Vi centripeta & conceſſis Figurarum
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curvilinearum quadraturis, requiruntur tum Trajectoriæ in qui
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bus corpora movebuntur, tum Tempora motuum in Trajectoriis
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inventis.
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<
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>Tendat vis quælibet ad centrum
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C
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& invenienda ſit Trajectoria
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VITKk.
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Detur Circulus
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VXY
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centro
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C
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intervallo quovis
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CV
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deſcriptus, centroque eodem deſcribantur alii quivis circuli
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ID,
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KE
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Trajectoriam ſecantes in
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I
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&
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K
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rectamque
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CV
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in
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D
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&
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E.
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Age tum rectam
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CNIX
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ſecantem circulos
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KE, VY
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in
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N
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&
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X,
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tum rectam
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CKY
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occurrentem circulo
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VXY
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in
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Y.
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Sint autem
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puncta
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I
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&
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K
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ſibi invicem viciniſſima, & pergat corpus ab
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V
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per
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I, T
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&
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K
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ad
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k;
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ſitque punctum
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type
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A
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locus ille de quo corpus aliud
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cadere debet ut in loco
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D
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velocitatem acquirat æqualem veloci
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tati corporis prioris in
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I
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; & ſtantibus quæ in Propoſitione XXXIX,
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lineola
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IK,
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dato tempore quam minimo deſcripta, erit ut ve
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locitas atque adeo ut latus quadratum areæ
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ABFD,
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& triangu
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lum
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ICK
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tempori proportionale dabitur, adeoque
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KN
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erit reci
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proce ut altitudo
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IC,
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id eſt, ſi detur quantitas aliqua Q, & alti
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tudo
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IC
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nominetur A, ut Q/A. </
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<
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>Hanc quantitatem Q/A nominemus Z,
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& ponamus eam eſſe magnitudinem ipſius Q ut ſit in aliquo
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caſu √
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ABFD
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ad Z ut eſt
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IK
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ad
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KN,
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& erit in omni caſu
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√
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ABFD
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ad Z ut
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IK
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ad
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KN,
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&
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ABFD
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type
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ad ZZ ut
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type
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<
expan
abbr
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IKq.
">IKque</
expan
>
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type
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ad
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<
expan
abbr
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KNq.
">KNque</
expan
>
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type
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& diviſim
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ABFD
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-ZZ ad ZZ ut
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IN quad
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ad
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KN quad,
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ad
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eoque √
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ABFD
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-ZZ ad (Z ſeu)Q/A ut
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IN
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ad
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KN,
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& propterea
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AX
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KN
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æquale (QX
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type
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IN/√ABFD
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type
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-ZZ). Unde cum
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YXXXC
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ſit ad
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AX
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KN
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ut
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CXq
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ad AA, erit rectangulum
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YXXXC
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æquale
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(QX
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INXCX quad.
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/AA√
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ABFD
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-ZZ). Igitur ſi in perpendiculo
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DF
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capiantur
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ſemper
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Db, Dc
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ipſis (Q/2√
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ABFD
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-ZZ) & (QX
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CX quad.
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/2AA√
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ABFD
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-ZZ)
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æquales reſpective, & deſcribantur curvæ lineæ
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ab, cd
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quas </
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