Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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evaneſcent, & rationem ultimam habebunt æqualitatis.
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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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1. Unde ſi per
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B
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ducatur tangenti parallela
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BF,
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rectam
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quamvis
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AF
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per
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A
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tranſe
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untem perpetuo ſecans in
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F,
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hæc
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BF
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ultimo ad arcum e
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vaneſcentem
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AB
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rationem
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habebit æqualitatis, eo quod
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completo parallelogrammo
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AFBD
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rationem ſemper habet æqua
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litatis ad
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AD.
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Corol.
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2. Et ſi per
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B
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&
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A
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ducantur plures rectæ
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BE, BD, AF,
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AG,
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ſecantes tangentem
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AD
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& ipſius parallelam
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BF
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; ratio ulti
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ma abſciſſarum omnium
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AD, AE, BF, BG,
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chordæque & ar
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cus
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AB
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ad invicem erit ratio æqualitatis. </
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Corol.
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3. Et propterea hæ omnes lineæ, in omni de rationibus ul
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timis argumentatione, pro ſe invicem uſurpari poſſunt. </
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LEMMA VIII.
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Si rectæ datæ
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AR, BR
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cum arcu
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AB,
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chorda
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AB
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& tangente
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AD,
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triangula tria
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ARB, ARB, ARD
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conſtituunt, dein
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puncta
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A, B
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accedunt ad invicem: dico quod ultima forma
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triangulorum evaneſcentium est ſimilitudinis, & ultima ratio
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æqualitatis.
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<
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B
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ad punctum
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A
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accedit,
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ſemper
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AB, AD, AR
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ad puncta longinqua
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b, d
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&
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r
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produci,
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ipſique
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RD
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parallela agi
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rbd,
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& arcui
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AB
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ſimilis ſemper ſit arcus
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Ab.
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Et coe
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untibus punctis
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A, B,
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angulus
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bAd
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eva
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neſcet, & propterea triangula tria ſemper
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finita
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rAb, rAb, rAd
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coincident, ſunt
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que eo nomine ſimilia & æqualia. </
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& hiſce ſemper ſimilia & proportionalia
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RAB, RAB, RAD
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ſient ultimo ſibi
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invicem ſimilia & æqualia.
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E. D.
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Corol.
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Et hinc triangula illa, in omni de rationibus ultimis argu
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mentatione, pro ſe invicem uſurpari poſſunt. </
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