Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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CH,
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(ut moris eſt) & valor ordinatim applicatæ reſolvatur in ſe
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riem convergentem: Problema per primos ſeriei terminos expe
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dite ſolvetur, ut in exemplis ſequentibus. </
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LIBER
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SECUNDUS.</
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Exempl.
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1. Sit Linea
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PFHQ
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Semicirculus ſuper diametro
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PQ
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deſcriptus, & requiratur Medii denſitas quæ faciat ut Projectile
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in hac linea moveatur. </
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<
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PQ
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in
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A,
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dic
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AQ n, AC a, CH e,
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&
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CD o
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: & erit
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DIq
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ſeu
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AQq-ADq=nn-aa-2ao-oo,
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ſeu
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ee-2ao-oo,
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& radice per methodum noſtram extracta, fiet
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DI=e-(ao/e)-(oo/2e)-(aaoo/2e
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3
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)-(ao
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3
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/2e
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3
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)-(a
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3
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o
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3
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/2e
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3
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)
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-&c. </
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<
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>Hic ſcribatur
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nn
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pro
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ee+aa,
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& evadet
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DI=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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3
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)
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-&c. </
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<
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>Hujuſmodi ſeries diſtinguo in terminos ſucceſſivos in hunc mo
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dum. </
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>Terminum primum appello in quo quantitas infinite par
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va
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o
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non extat; ſecundum in quo quantitas illa eſt unius dimen
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ſionis, tertium in quo extat
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duarum, quartum in quo
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trium eſt, & ſic in infiNI
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tum. </
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qui hic eſt
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e,
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denotabit ſem
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per longitudinem Ordinatæ
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CH
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inſiſtentis ad initium
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indefinitæ quantitatis
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o
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; ſe
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cundus terminus qui hic eſt
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(
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ao/e
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), denotabit differentiam
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inter
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CH
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&
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DN,
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id eſt, lineolam
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MN
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quæ abſcinditur com
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plendo parallelogrammum
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HCDM,
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atque adeo poſitionem tan
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gentis
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HN
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ſemper determinat: ut in hoc caſu capiendo
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MN
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ad
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HM
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ut eſt (
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ao/e
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) ad
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o,
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ſeu
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a
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ad
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e.
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Terminus tertius qui hic eſt
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(
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nnoo/2e
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3
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) deſignabit lineolam
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IN
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quæ jacet inter tangentem & cur
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vam, adeoQ.E.D.terminat angulum contactus
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IHN
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ſeu curvatu
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ram quam curva linea habet in
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H.
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Si lineola illa
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IN
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finitæ eſt
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magnitudinis, deſignabitur per terminum tertium una cum ſe
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quentibus in infinitum. </
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<
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>At ſi lineola illa minuatur in infinitum, </
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