Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1centium arcuum ab, bc, cd, &c.comprehenditur, coincidit ultimo
cum Figura curvilinea.
DE MOTU
CORPORUM
Corol.3. Ut & Figura rectilinea circumſcripta quæ tangentibus
eorundem arcuum comprehenditur.
Corol.4. Et propterea hæ Figuræ ultimæ (quoad perimetros acE,)
non ſunt rectilineæ, ſed rectilinearum limites curvilinei.
LEMMA IV.
Si in duabus FigurisAacE, PprT, inſcribantur (ut ſupra) duæ
parallelogrammorum ſeries, ſitQ.E.I.em amborum numerus, & ubi
latitudines in infinitum diminuuntur, rationes ultimæ parallelo­
grammorum in una Figura ad parallelogramma in altera, ſingulorum
ad fingula, ſint eædem; dico quod Figuræ duæAacE, PprT,
ſunt ad invicem in eadem illa ratione.
7[Figure 7]
Etenim ut ſunt parallelogramma ſingula ad ſingula, ita (compo­
nendo) fit ſumma omnium ad ſummam omnium, & ita Figura ad
Figuram; exiſtente nimirum Figura priore (per Lemma 111) ad ſum­
mam priorem, & Figura poſteriore ad ſummam poſteriorem in ra­
tione æqualitatis. que E. D.
Corol.Hinc ſi duæ cujuſcunque generis quantitates in eundem
partium numerum utcunQ.E.D.vidantur; & partes illæ, ubi numerus
earum augetur & magnitudo diminuitur in infinitum, datam obti­
neant rationem ad invicem, prima ad primam, ſecunda ad ſecundam,
cæteræque ſuo ordine ad cæteras: erunt tota ad invicem in eadem
illa data ratione.
Nam ſi in Lemmatis hujus Figuris ſumantur pa-

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