Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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De loco
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P,
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ſecundum lineam
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PR,
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exeat corpus
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P,
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cum data velo
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citate, & mox inde, cogente vi centripeta, deflectat illud in CoNI
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ſectionem
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<
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Hanc igitur recta
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PR
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tanget in
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P.
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Tangat itidem
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recta aliqua
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pr
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Orbitam
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pq
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in
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p,
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& ſi ab
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S
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ad eas tangentes demitti
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intelligantur perpendicula, erit (per Corol. </
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<
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>1. Prop. </
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<
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>XVI.) latus re
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ctum principale Coniſectionis ad latus rectum principale Orbitæ, in
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ratione compoſita ex duplicata ratione perpendiculorum & dupli
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cata ratione velocitatum, atque adeo datur. </
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<
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>Sit iſtud
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L.
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Da
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tur præterea Coniſe
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<
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ctionis umbilicus
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S.
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<
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Anguli
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RPS
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com
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plementum ad du
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os rectos fiat angu
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lus
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RPH,
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& dabi
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tur poſitione linea
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PH,
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in qua umbilicus
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alter
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H
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locatur. </
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<
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>De
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miſſo ad
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PH
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perpen
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diculo
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SK,
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erigi intelligatur ſemiaxis conjugatus
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BC,
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& erit
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<
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SPq.-2KPH+PHq.=SHq.=4CHq.=4BHq-4BCq.=
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—SP+PH: quad. -LX—SP+PH=SPq.+2SPH+PHq.
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-LX—SP+PH.
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Addantur utrobique 2
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KPH-SPq-PHq
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+LX—SP+PH,
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& fiet
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LX—SP+PH=2SPH+2KPH,
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ſeu
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SP+PH,
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ad
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PH,
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ut 2
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SP+2KP
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ad
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L.
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Unde datur
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PH
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tam longitudine quam poſitione. </
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<
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>Nimirum ſi ea fit corporis &c. </
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<
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>in
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P
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velocitas, ut latus rectum
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L
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minus fuerit quam 2
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SP+2KP,
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<
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jacebit
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PH
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ad eandem partem tangentis
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PR
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cum linea
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PS,
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<
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adeoque figura erit Ellipſis, & ex datis umbilicis
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S, H,
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& axe
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principali
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SP+PH,
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dabitur: Sin tanta ſit corporis velocitas ut
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latus rectum
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L
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æquale fuerit 2
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SP+2KP,
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longitudo
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PH
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infi
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nita erit, & propterea figura erit Parabola axem habens
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SH
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paral
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lelum lineæ
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PK,
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& inde dabitur. </
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<
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>Quod ſi corpus majori adhuc
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cum velocitate de loco ſuo
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P
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exeat, capienda erit longitudo
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PH
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<
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ad alteram partem tangentis, adeoque tangente inter umbilicos per
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gente, figura erit Hyperbola axem habens principalem æqualem dif
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ferentiæ linearum
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SP
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&
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PH,
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& inde dabitur.
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Q.E.I.
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LIBER
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PRIMUS.</
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Corol.
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1. Hinc in omni Coniſectione ex dato vertice principali
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D,
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latere recto
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L,
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& umbilico
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S,
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datur umbilicus alter
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H
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capiendo
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DH,
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ad
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DS
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ut eſt latus rectum ad differentiam inter latus rectum &
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4
<
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DS.
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Nam proportio
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SP+PH
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ad
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PH
<
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ut 2
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SP+2KP
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ad
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L,
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