Full text: Volumen secundum. Opera geometrica. Opera astronomica. Varia de optica. (2)

0125-01

61. VERA
CIRCULI ET HYPERBOLÆ
QUADRATURA
AUTHORE
JACOBO GREGORIO.

LECTORI GEOMETRÆ
SALUTEM.

MEcum aliquando cogitabam, ami-
ce Lector, num Analytica cum
ſuis quinque operationibus eſſet
ſufficiens, & generalis methodus
inveſtigandi omnes quantitatum
proportiones, ut in initio ſuæ Ge-
ometriæ affirmare videtur Car-
teſius; ſi enim ita eſſet, poſſibile foret ejus ope to-
ties decantatam circuli quadraturam exhibere: cumque hæc mente revolverem, facile percepi ex
hactenus repertis circuli proprietatibus nullam poſſe
analyſin inſtitui tali ſtructuræ inſervientem: dein-
de mihi alias quærenti incidit in mentem hujus ſe-
cunda, prima enim in circulo vulgo eſt cognita: ex hiſce percepi ſeriem polygonorum convergentem,
cujus terminatio eſt circuli ſector; ubi ſtatim vidi

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