Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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termini ſubſequentes evadent infinite minores tertio, ideoque neg
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ligi poſſunt. </
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<
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>Terminus quartus determinat variationem curva
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turæ, quintus variationem variationis, & ſic deinceps. </
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ter patet uſus non contemnendus harum Serierum in ſolutione
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Problematum quæ pendent a tangentibus & curvatura curvarum. </
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DE MOTU
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CORPORUM</
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<
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e-(ao/e)-(nnoo/2e
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3
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)-(anno
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3
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/2e
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5
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)
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-&c, cum ſerie
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P-Q
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o
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-R
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oo
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-S
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o
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3
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-&c. </
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>& perinde pro P, Q, R & S ſcribatur
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e, (a/e), (nn/2e
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3
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)
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& (
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ann/2e
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5
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), & pro √1+QQ ſcribatur √1+(
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aa/ee
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) ſeu
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n/e,
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&
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prodibit Medii denſitas ut (
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a/ne
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), hoc eſt, (ob datam
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n,
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) ut
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a/e,
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ſeu
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(
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AC/CH
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), id eſt, ut tangentis longitudo illa
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HT
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quæ ad ſemidiame
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trum
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AF
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ipſi
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PQ
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normaliter inſiſtentem terminatur: & reſiſten
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tia erit ad gravitatem ut 3
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a
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ad 2
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n,
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id eſt, ut 3
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AC
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ad Circuli
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diametrum
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PQ
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: velocitas autem erit ut √
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CH.
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Quare ſi corpus
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juſta cum velocitate ſecundum lineam ipſi
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PQ
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parallelam exeat
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de loco
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F,
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& Medii denſitas in ſingulis locis
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H
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ſit ut longi
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tudo tangentis
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HT,
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& reſiſtentia etiam in loco aliquo
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H
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ſit ad
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vim gravitatis ut 3
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AC
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ad
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PQ,
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corpus illud deſcribet Circuli
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quadrantem
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FHQ. Q.E.I.
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<
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>At ſi corpus idem de loco
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P,
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ſecundum lineam ipſi
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PQ
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per
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pendicularem egrederetur, & in arcu ſemicirculi
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PFQ
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moveri
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inciperet, ſumenda eſſet
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AC
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ſeu
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a
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ad contrarias partes centri
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A,
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& propterea ſignum ejus mutandum eſſet & ſcribendum -
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a
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pro
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+
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a.
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Quo pacto prodiret Medii denſitas ut -
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a/e
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. </
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<
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autem denſitatem, hoc eſt, quæ motus corporum accelerat, Na
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tura non admittit: & propterea naturaliter fieri non poteſt, ut
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corpus aſcendendo a
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P
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deſcribat Circuli quadrantem
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PF.
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Ad
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hunc effectum deberet corpus a Medio impellente accelerari, non
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a reſiſtente impediri. </
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Exempl.
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2. Sit linea
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PFHQ
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Parabola, axem habens
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AF
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ho
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rizonti
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PQ
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perpendicularem, & requiratur Medii denſitas quæ
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faciat ut Projectile in ipſa moveatur. </
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<
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>Ex natura Parabolæ, rectangulum
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PDQ
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æquale eſt rectan
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gulo ſub ordinata
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DI
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& recta aliqua data: hoc eſt, ſi dicantur </
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