Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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DE MOTU
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CORPORUM</
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Corol.
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5. Et quoniam
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DB, db
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ſunt ultimo parallelæ & in dupli
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cata ratione ipſarum
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AD, Ad:
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erunt areæ ultimæ curvilineæ
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ADB,
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Adb
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(ex natura Parabolæ) duæ tertiæ partes triangulorum rectili
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neorum
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ADB, Adb
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; & ſegmenta
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AB, Ab
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partes tertiæ eo
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rundem triangulorum. </
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>Et inde hæ areæ & hæc ſegmenta erunt in
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triplicata ratione tum tangentium
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AD, Ad
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; tum chordarum &
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arcuum
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AB, Ab.
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Scholium.
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>Cæterum in his omnibus ſupponimus angulum contactus nec in
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finite majorem eſſe angulis contactuum, quos Circuli continent cum
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tangentibus ſuis, nec iiſdem infinite minorem; hoc eſt, curvaturam
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ad punctum
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A,
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nec infinite parvam eſſe nec infinite magnam, ſeu
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intervallum
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AJ
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finitæ eſſe magnitudinis. </
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<
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>Capi enim poteſt
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DB
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ut
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3
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:
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quo in caſu Circulus nullus per punctum
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A
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inter tangen
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tem
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AD
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& curvam
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AB
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duci poteſt, proindeque angulus contactus
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erit infinite minor Circularibus. </
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>Et ſimili argumento ſi fiat
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DB
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ſucceſſive ut
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AD
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4
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,
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AD
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5
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,
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AD
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6
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,
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AD
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7
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, &c. </
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>habebitur ſeries an
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gulorum contactus pergens in infinitum, quorum quilibet poſte
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rior eſt infinite minor priore. </
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>Et ſi fiat
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DB
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ſucceſſive ut
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AD
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2
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,
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AD
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3/2,
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AD
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4/3,
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AD
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5/4,
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AD
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6/5,
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AD
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7/6, &c. </
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<
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>habebitur alia ſeries infinita
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angulorum contactus, quorum primus eſt ejuſdem generis cum Cir
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cularibus, ſecundus infinite major, & quilibet poſterior infinite ma
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jor priore. </
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>Sed & inter duos quoſvis ex his angulis poteſt ſeries
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utrinQ.E.I. infinitum pergens angulorum intermediorum inſeri,
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quorum quilibet poſterior erit infinite major minorve priore. </
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ſi inter terminos
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AD
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2
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&
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AD
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3
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inſeratur ſeries
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AD
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(13/6),
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AD
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(1
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/5),
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AD
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9/4,
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AD
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7/3,
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AD
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5/2,
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AD
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8/3,
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AD
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(11/4),
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AD
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(14/5),
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AD
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(17/6), &c. </
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<
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>Et rur
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ſus inter binos quoſvis angulos hujus ſeriei inſeri poteſt ſeries no
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va angulorum intermediorum ab invicem infinitis intervallis diffe
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rentium. </
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<
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>Neque novit natura limitem. </
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<
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ſtrata ſunt, facile applicantur ad ſolidorum ſuperficies curvas &
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contenta. </
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<
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>Præmiſi vero hæc Lemmata, ut effugerem tædium dedu
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cendi perplexas demonſtrationes, more veterum Geometrarum, ad
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abſurdum. </
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<
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>Contractiores enim redduntur demonſtrationes per me
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thodum Indiviſibilium. </
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<
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>Sed quoniam durior eſt Indiviſibilium hy
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potheſis, & propterea methodus illa minus Geometrica cenſetur;
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malui demonſtrationes rerum ſequentium ad ultimas quantitatum </
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