Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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a ſuperficie, proportiona
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lis;
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PHTF
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recta axi
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parallela per corpus tran
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ſiens, &
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GF, IH
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rectæ
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a punctis
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G
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&
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I
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in pa
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rallelam illam
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PHTF
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perpendiculariter demiſ
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ſæ. </
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>Dico jam quod area
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AOP,
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radio
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OP
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ab iNI
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tio motus deſcripta, ſit
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tempori proportionalis. </
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Nam vis
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TG
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(per Le
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gum Corol. </
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>2.) reſolvitur
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in vires
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TF, FG
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; & vis
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TI
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in vires
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TH, HI:
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Vires autem
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TF, TH
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agendo ſecundum lineam
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PF
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plano
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AOP
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per
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pendicularem mutant ſo
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lummodo motum cor
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poris quatenus huic plano perpendicularem. </
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>Ideoque motus ejus
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quatenus ſecundum poſitionem plani factus, hoc eſt, motus pun
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cti
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P
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quo Trajectoriæ veſtigium
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AP
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in hoc plano deſcri
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bitur, idem eſt ac ſi vires
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TF, TH
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tollerentur, & corpus ſolis vi
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ribus
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FG, HI
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agitaretur; hoc eſt, idem ac ſi corpus in plano
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AOP,
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vi centripeta ad centrum
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O
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tendente & ſummam virium
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FG
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&
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HI
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æquante, deſcriberet curvam
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AP.
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Sed vi tali deſcribi
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tur area
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AOP
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(per Prop. </
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<
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>1.) tempori proportionalis.
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Q.E.D.
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DE MOTU
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CORPORUM</
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Corol.
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Eodem argumento ſi corpus a viribus agitatum ad centra
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duo vel plura in eadem quavis recta
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CO
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data tendentibus, deſcri
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beret in ſpatio libero lineam quamcunque curvam
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ST
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; foret area
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AOP
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tempori ſemper proportionalis. </
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PROPOSITIO LVI. PROBLEMA XXXVII.
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Conceſſis Figurarum curvilinearum quadraturis, datiſque tum lege
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Vis centripetæ ad centrum datum tendentis, tum ſuperficie cur
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va cujus axis per centrum illud trænſit; invenieuda est Traje
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ctoria quam corpus in eadem ſuperficie deſcribet, de loco dato, data
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cum Velocitate, verſus plagam in ſuperficie illa datam egreſſum.
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