Huygens, Christiaan, Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica

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192462VERA CIRC. ET HYPERB. QUADR. tenorem hujus 11: poſſem quoque adhuc alia methodo par-
ticulari demonſtrare arcum circularem non habere rationem
analyticam ad ſuam chordam datam:
ſed plura non addo,
geometras interim pro ſcientiæ incremento admonens, me
reperiſſe in quibusdam figuris (quas Carteſius ſecundi gene-
ris appellat) tres focos, ſeu tria puncta, à quibus ductarum
in quodlibet curvæ punctum rectarum ſumma vel differen-
tia ſemper eſt eadem:
unde mihi veriſimile videtur ſicut omnis
curvæ primi generis duos habent focos vel reales vel imagi-
narios, ita omnes ſecundi generis habere tres, omnes ter-
tii quatuor, &
ſic in infinitum: quæ certè ſpeculatio ſcru-
tatu digniſſima eſt, eſſet enim admiranda figurarum geome-
tricarum proprietas, &
mechanicæ omnium æquationum pra-
xi utiliſſima.
FINIS.
76[Figure 76]

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