Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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ta, & eadem pro radio ordinato primo adhibita, tranſmutetur fi
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gura (per Lem. </
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<
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>XXII) in figuram novam, & tangentes binæ, quæ ad
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radium ordinatum primum concurrebant, jam evadent parallelæ. </
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<
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to illæ
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hi
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&
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kl, ik
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&
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hl
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continentes parallelogrammum
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hikl.
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Sit
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que
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p
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punctum in hac nova figura, puncto in figura prima dato
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reſpondens. </
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<
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>Per figuræ centrum
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O
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agatur
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pq,
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& exiſtente
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Oq
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æ
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quali
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Op,
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erit
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q
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punctum alterum per quod ſectio Conica in hac
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figura nova tranſire debet. </
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>Per Lemmatis XXII operationem in
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verſam transferatur hoc punctum in figuram primam, & ibi habe
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buntur puncta duo per quæ Trajectoria deſcribenda eſt. </
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<
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>Per ea
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dem vero deſcribi poteſt Trajectoria illa per Prob. </
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<
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>XVII.
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q.E.F.
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LIBER
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PRIMUS.</
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LEMMA XXIII.
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Si rectæ duæ poſitione datæ
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AC, BD
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ad data puncta
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A, B,
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ter
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minentur, datamque habeant rationem ad invicem, & recta
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CD,
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qua puncta indeterminata
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C, D
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junguntur, ſecetur in ra
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tione data in
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K:
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dico quod punctum
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K
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locabitur in recta poſi
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tione data.
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<
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>Concurrant enim rectæ
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AC,
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BD
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in
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E,
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& in
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BE
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capiatur
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BG
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ad
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AE
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ut eſt
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BD
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ad
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AC,
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ſit
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que
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FD
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ſemper æqualis datæ
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<
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EG
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; & erit ex conſtructione
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EC
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ad
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GD,
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hoc eſt, ad
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EF
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ut
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AC
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ad
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BD,
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adeoQ.E.I. ratione
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data, & propterea dabitur ſpecie
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triangulum
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EFC.
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Secetur
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CF
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in
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L
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ut ſit
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CL
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ad
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CF
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in ratio
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ne
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CK
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ad
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CD
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; &, ob datam il
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lam rationem, dabitur etiam ſpecie triangulum
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EFL
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; proindeque
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punctum
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L
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locabitur in recta
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EL
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poſitione data. </
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<
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>Junge
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LK,
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&
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ſimilia erunt triangula
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CLK, CFD
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; &, ob datam
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FD
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& datam
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rationem
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LK
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ad
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FD,
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dabitur
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LK.
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Huic æqualis capiatur
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EH,
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& erit ſemper
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ELKH
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parallelogrammum. </
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<
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tum
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K
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in parallelogrammi illius latere poſitione dato
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HK. Q.E.D.
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