Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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Idem aliter.
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LIBER
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PRIMUS.</
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<
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>E punctis datis junge tria quævis
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A, B, C
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; &, circum duo eorum
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B, C
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ceu polos, rotando angulos magnitudine datos
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ABC,
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ACB,
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applicentur cru
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ra
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BA, CA
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primo ad
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punctum
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D,
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deinde
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ad punctum
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P,
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& no
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tentur puncta
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M, N
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in
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quibus altera crura
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BL, CL
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caſu utroque
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ſe decuſſant. </
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>Agatur
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recta infinita
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MN,
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&
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rotentur anguli illi mo
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biles circum polos ſuos
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B, C,
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ea lege ut cru
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rum
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BL, CL
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vel
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BM, CM
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interſectio
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quæ jam ſit
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m
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incidat
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ſemper in rectam illam
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infinitam
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MN
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& cru
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rum
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BA, CA,
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vel
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BD, CD
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interſectio, quæ jam ſit
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d,
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Trajecto
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riam quæſitam
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PAD dB
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delineabit. </
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<
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>Nam punctum
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d,
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per Lem. </
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XXI, continget ſectionem Conicam per puncta
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B, C
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tranſeuntem; &
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ubi punctum
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m
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accedit ad puncta
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L, M, N,
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punctum
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d
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(per con
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ſtructionem) accedet ad puncta
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A, D, P.
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Deſcribetur itaque ſec
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tio Conica tranſiens per puncta quinque
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A, B, C, P, D. q.E.F.
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Corol.
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1. Hinc recta expedite duci poteſt quæ Trajectoriam quæ
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ſitam, in puncto quovis dato
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B,
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continget. </
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<
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d
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ad
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punctum
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B,
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& recta
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Bd
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evadet tangens quæſita. </
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Corol.
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2. Unde etiam Trajectoriarum Centra, Diametri & Latera
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recta inveniri poſſunt, ut in Corollario ſecundo Lemmatis XIX. </
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Scholium.
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<
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>Conſtructio prior evadet paulo ſimplicior jungendo
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BP,
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& in ea,
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ſi opus eſt, producta capiendo
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Bp
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ad
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BP
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ut eſt
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PR
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ad
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PT
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; &
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per
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p
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agendo rectam infinitam
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p
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d ipſi
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SPT
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parallelam, inque ea
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capiendo ſemper
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p
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d æqualem
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Pr
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; & agendo rectas
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Bd, Cr
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con
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currentes in
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d.
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Nam cum ſint
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Pr
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ad
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Pt, PR
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ad
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PT, pB
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ad
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PB,
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p
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d ad
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Pt
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in eadem ratione; erunt
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p
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d &
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Pr
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ſemper æqua-</
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