Biancani, Giuseppe, Aristotelis loca mathematica, 1615

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5
Ex cap. 23. ſecti primi lib. 1. (Vt quod diameter incommenſurabilis eo, quod
imparia æqualia paribus fiant, ſi fuerit poſita commenſurabilis.
æqualia igitur fieri
imparia paribus ratiocinantur, diametrum vtrò incommenſurabilem eſſe ex ſuppo­
ſitione monſtrant, quoniam falſum accidit propter contradictionem) Euclides pri­
mis duabus definitionibus 10. elem.
definit, quæ nam ſint magnitudines
commenſ.
& quæ incommenſ. ſic; commenſ. magnitudines dicuntur, quas
3[Figure 3]
eadem menſura metitur, vt ſi fuerint duæ magnitu­
dines, A, & B, quas eadem menſura C, ideſt quan­
titas C, metiatur, ideſt quantitas C, applicata quan­
titati A, & per ipſam aliquoties replicata ipſam ad­
æquatè abſumat, vt ſi linea C, quinquies ſuper li­
neam A, replicata eam præcisè, & perfectè omninò
adæquaret: & eadem linea C, applicata lineæ B, & ſuper illam ter, v.g. re­
petita ipſam conſumeret, diceretur vtranque metiri, & proinde duas lineas
A, & B, eſſe comm. definit poſtea incommenſ. hoc modo, incomm. autem, qua­
rum nullam contingit communem menſuram reperiri; vt ſi duarum linea­
4[Figure 4]
rum, A, B, nunquam poſſet reperiri aliqua menſu­
ra, quæ vtranque adæquatè metiretur, v. g. ſi linea
C, menſuraret A, quater ſumpta, ter autem ſumpta
non adæquaret omnino lineam B, ſed deficeret, vel ex­
cederet aliquantulum, atque hoc fieret in quauis alia
menſura, loco ipſius C, aſſumpta, ſiue maior, ſiue
minor ipſa C, vt vtranque nunquam perfectè metiretur, eſſent duæ illæ lineæ
incommenſ.
Extare porrò tales lineas, & ſuperficies, & corpora, eaque; quam­
plurima, ac penè infinita ex 10. Elem. manifeſtum eſt.
inuentum autem hu­
ius aſymmetriæ, quod Pythagoricis veteres attribuunt, mihi ſemper viſum
eſt omni maius admiratione, cum nulla experientia, nullusque; effectus in ip­
ſius cognitionem potuerit priſcos illos Geometras inducere.
Quapropter
non immeritò diuinus ille Plato lib. 7. de legib.
huius aſymmetriæ ignora­
tionem, adeo deteſtatus eſt, vt eam non hominum, ſed ſuum, pecorumque
ignorantiam cenſuerit.
inter lineas incommenſ. ſunt diameter, & latus eiuſ­
dem quadrati, quia nulla poteſt reperiri menſura quantumuis exigua, vti
5[Figure 5]
eſt lineola E, in præſenti quadrato, etiamſi illam in
infinitum ſubdiuidas, quæ vtranque lineam, diame­
trum ſcilicet A C, & latus quoduis ex quatuor, v.g.
latus B C, præcisè omnino metiatur.
theorema
iſtud demonſtratur in vltima 10. Elem. eodem me­
dio, quod ab Ariſtotele hic innuitur; Euclides ex
ſuppoſitione
alterius partis contradictionis ipſius

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