Newton, Isaac
,
Philosophia naturalis principia mathematica
,
1713
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137
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id eſt, ratio mutationum momentanearum curvæ
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AP,
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rectæ
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CP,
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arcus circularis
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BP,
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ac rectæ
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VP,
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eadem erit quæ linea
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rum
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PV, PF, PG, PI
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reſpective. </
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<
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VF
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ad
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CF
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&
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VH
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ad
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CV
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perpendiculares ſunt, angulique
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HVG, VCF
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prop
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terea æquales; & angulus
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VHG
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(ob angulos quadrilateri
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HVEP
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ad
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V
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&
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P
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rectos) angulo
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CEP
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æqualis eſt, ſimilia erunt tri
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angula
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VHG, CEP
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; & inde fiet ut
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EP
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ad
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CE
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ita
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HG
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ad
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HV
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ſeu
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HP
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& ita
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KI
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ad
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KP,
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& compoſite vel diviſim ut
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CB
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ad
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CE
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ita
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PI
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ad
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PK,
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& duplicatis conſequentibus ut
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CB
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ad 2
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CE
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<
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ita
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PI
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ad
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PV,
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atQ.E.I.a adeo
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Pq
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ad
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Pm.
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Eſt igitur decremen
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tum lineæ
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VP,
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id eſt, incrementum lineæ
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BV-VP
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ad incremen
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tum lineæ curvæ
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AP
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in data ratione
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CB
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ad 2
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CE,
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& prop
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terea (per Corol. </
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<
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>Lem. </
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<
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>IV.) longitudines
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BV-VP
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&
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AP,
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in
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crementis illis genitæ, ſunt in eadem ratione. </
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<
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>Sed, exiſtente
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BV
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ra
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dio, eſt
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VP
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co-ſinus anguli
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BVP
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ſeu 1/2
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BEP,
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adeoque
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BV-VP
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ſinus verſus ejuſdem anguli; & propterea in hac Rota, cujus radius
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eſt 1/2
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BV,
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erit
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BV-VP
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duplus ſinus verſus arcus 1/2
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BP.
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Ergo
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AP
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eſt ad duplum ſinum verſum arcus 1/2
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BP
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ut 2
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CE
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ad
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CB.
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<
expan
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E. D.
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LIBER
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PRIMUS.</
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<
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>Lineam autem
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AP
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in Propoſitione priore Cycloidem extra
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Globum, alteram in poſteriore Cycloidem intra Globum diſtincti
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onis gratia nominabimus. </
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Corol.
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1. Hinc ſi deſcribatur Cyclois integra
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ASL
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& biſecetur
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ea in
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S,
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erit longitudo partis
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PS
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ad longitudinem
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VP
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(quæ du
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plus eſt ſinus anguli
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VBP,
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exiſtente
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EB
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radio) ut 2
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CE
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ad
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CB,
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atque adeo in ratione data. </
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Corol.
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2. Et longitudo ſemiperimetri Cycloidis
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AS
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æquabitur
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lineæ rectæ quæ eſt ad Rotæ diametrum
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BV,
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ut 2
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CE
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ad
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CB.
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PROPOSITIO L. PROBLEMA XXXIII.
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Facere ut Corpus pendulum oſcilletur in Cycloide data.
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<
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>Intra Globum
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QVS,
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centro
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C
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deſcriptum, detur Cyclois
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QRS
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biſecta in
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R
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& punctis ſuis extremis
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Q
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&
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S
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ſuperficiei Globi hinc
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inde occurrens. </
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>
<
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>Agatur
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CR
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biſecans arcum
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QS
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in
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O,
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& produca
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tur ea ad
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A,
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ut ſit
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CA
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ad
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CO
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ut
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CO
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ad
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CR.
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Centro
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C
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in-</
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