Guevara, Giovanni di
,
In Aristotelis mechanicas commentarii
,
1627
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relinquitur (concludit Ariſtoteles) ſi ex ipſo circulo conſti
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tuto, aliæ poſtea oriantur contrarietates, vel alia contraria in
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ipſo conſiderentur, vt mox ex dicendis patebit. </
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De ſecunda circuli proprietate.
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<
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<
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<
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n primis enim lineæ illi, quæ circuli orbem am
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plectitur, nullam habenti latitudinem contraria
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quodammodo ineſſe apparans, concauum ſcilicet,
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& curuum. </
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<
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">Hæc autem eo à ſe inuicem diſtant
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modo, quo magnum, & paricum, illorum etenim
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medium eſt æquale: horum verò rectum; quapropter cum ad
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ſe inuicem commutantur, illa
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abbr
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quidẽ
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prius æqualia fieri neceſſe
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est, quam extremorum vtrumlibet: lineam vero rectam,
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quando eſt curua, concaua, aut ex huiuſmodi rurſum curua ſit,
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& circularis. </
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<
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">Vnum quidem igitur iſtuc abſurdum ineſt circulo.
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<
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">COMMENTARIVS.</
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<
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">Secundò admirabilem ſe natura circuli oſtendit, ſi ſu
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matur infacto eſſe, quod cum in primis (inquit Ariſto
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teles) linea, quæ ipſius circuli orbem complectitur, ac
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peripheria, ſeu
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circunferẽtia
">circunferentia</
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nuncupatur, ſit per ſe quoad la
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titudinem, & profunditatem indiuiſibilis, ſimul tamen tan
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quam ex duobus contrarijs inter ſe coniunctis conſtituatur
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concaua, & curua, ſiuè conuexa. </
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<
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">Etenim eſt verè terminus
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extimus, & conuexum ipſius circuli, ac ſimul ambiens, &
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complectens in ſua concauitate ipſam ſuperficilem circuli:
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Concauum autem, & conuexum ſe habent ſicut magnum,
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& paruum. </
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<
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id
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">Horum enim medium eſt æquale, illorum verò
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rectum. </
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<
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id
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">Quarè ſicut cum magnum, & paruum inuicem,
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commutantur, prius perueniunt ad æquale, quàm ad hoc vt
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magnum conſtituatur paruum, & paruum conſtituatur ma</
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