Biancani, Giuseppe
,
Aristotelis loca mathematica
,
1615
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Proclum, ita 1000. ad 500, & poſtea, vt Plato ad 1000. ita Proclus ad 500.
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iuxta
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merita, & quidem iſta eſt huiuſmodi moralis diſtributio, cum
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modis argumentandi ab Euclide comprobatis, nitatur.</
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311</
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(Hanc verò proportionalitatem Mathematici Geometricam vocant:
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propterea quod in Geometrica euenit, vt eandem totum ad totum rationem habeat,
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quam habet alterutrum, ad alterutrum)
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ideſt, hanc duarum Geometricarum
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rationum ſimilitudinem Mathematici proportionalitatem Geometricam
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appellant, propterea quod in hac duarum rationum geometricarum ſimili
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tudine accidit, vt ſit totum ad totum, quemadmodum etiam partes toto
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rum, vt ſupra explicatum eſt; quod non accidit in duarum proportionum
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arithmeticarum ſimilitudine; ſi enim ponamus has duas rationes arithme
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ticas ſimiles, vt 10. ad 8. ita 6. ad 4. quæ ſunt ſimiles, propter ſimiles exceſ
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ſus primorum, & ſecundorum terminorum, cum
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exceſſus ſit binarij.
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minis, cum ibi ſit exceſſus binarij, hic verò quaternarij. </
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Ariſt. ratio; quam adhuc melius declaraſſe libet. </
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">Geometrica igitur pro
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portionalitas ita dicta eſt, quia quælibet proportio poteſt in materia Geo
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metrica, lineis, ſuperficiebus, & corporibus continuari in quatuor termi
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nis, ita vt proportionalitas, ſeu ſimilitudo rationum exurgat, quod in nu
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meris fieri ſemper nequit, cum plures ſint proportiones, quæ numeris ex
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primi nequeunt, vt ſunt eæ, quas irrationales appellant, cuiuſmodi eſt inter
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diametrum, & coſtam eiuſdem quadrati, cuius nec proportio, nec propor
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tionalitas in numeris reperiri poteſt, quæ tamen in lineis, ſuperficiebus, ac
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corporibus eſſe poſſunt: eſt enim vt diameter vnius quadrati ad latus eiuſ
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dem, ita idem latus ad aliam lineam inuentam per 11. 6. vel vt diameter ad
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coſtam, ita quælibet alia linea ad aliam inuentam, per 12. 6. omnis igitur
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proportionalitas rebus Geometricis ineſſe poteſt; non autem numeris, in
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quibus ſolum poſſunt eſſe rationes rationales, ſeu
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commenſurabilium;
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latius igitur patet Geometrica hæc ſimilitudo, quàm Arithmetica, cùm
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Geometrica complectatur tam rationales, quàm irrationales. </
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tur talis proportionalitas appellari debuit à rebus Geometricis, in quibus
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ſemper reperitur, non autem ab Arithmeticis, cum quibus ſæpius reperiri
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nequit. </
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(Non eſt autem continens hæc proportio: non enim vnus, & idem ter
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minus efficitur, & cui, & quod)
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ideſt, hæc proportionalitas contracta ad res
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practicas, non eſt continens, ideſt, quæ conſiſtat in tribus tantum terminis,
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quorum medius eſt, ad quem refertur primus, & is qui refertur ad ter
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tium; ſed eſt diſiuncta, quia conſtat ſemper quatuor terminis, quorum duo
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ſunt perſonæ aliquæ, reliqui verò duo ſunt res, quæ perſonis debentur, vt ſi
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ſint Plato, & Proclus, quibus iuxta meritorum quantitatem debeant diuidi
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1500. aurei, debent diuidi aurei in duas partes, quæ habeant eam propor
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tionem, quam habet Plato ad Proclum. </
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Proclus, erit vt Plato ad Proclum, ita 1000. ad 500.</
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terminis conſiſtere poſſe, & ideo non eſſe continuam, ſed diſiunctam, vt vo
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lebat Ariſtot.</
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