Biancani, Giuseppe
,
Aristotelis loca mathematica
,
1615
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rum, ſiue dicas quadrata
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earum eſſe commenſurabilia, v. g. linea dua
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rum vnciarum, & linea trium vnciarum ſunt
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commenſurabiles longitudine, & potentia,
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quia potentia lineæ duarum vnciarum, ſiue
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quadratũ
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, eſt quatuor vnciarum ſuperficia
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lium: & quadratum lineæ trium vnciarum,
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eſt nouem vnciarum quadratarum, vt patet
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in figuris, quorum quadratorum communis
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menſura eſt vncia vna quadrata. </
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illi nullo modo diuidi poſſe contendebant.</
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279</
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">Tertius locus
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(Præterea ſi quis communem ſtatam, ac determinatam menſu
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ram faciat diuiduam, non erit amplius in rerum natura linea vlla rationalis, aut
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irrationalis, reſpectu expoſitæ, ac determinatæ lineæ; neque aliarum vlla erit, de
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quibus modo dictum eſt, veluti quam Apotomen vocant ex duobus nominibus. </
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rùm neque ſecundum ſe aliquam definitam naturam habebunt, ſed collatæ ſibi ipſis
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tam rationales, quàm irrationales erunt omnes.
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">Hæc eſt alia eorumdem ratio ad idem comprobandum: quam, vt benè
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percipiamus, nonnulla prius ex definitionibus 10. Elem. ſunt explicanda:
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vt quæ nam ſint lineæ rationales, quæ irrationales, quæ ex binis nomini
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bus, quæ Apotomæ.</
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">Propoſita igitur linea quapiam, v. g. trium palmorum qualis eſt linea A,
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poſſunt inueniri quamplurimæ lineæ, quarum aliæ ſint illi longitudine com
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menſurabiles, ſiue quæ cum expoſita A, ha
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beant communem menſuram. </
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">v. g. linea B,
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palmorum eſt commenſurabilis lineæ
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A, quia vtramque communis menſura vnius
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palmi metitur: aliæ verò ſint eidem A, lon
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gitudine incommenſurabiles, qualis eſſet diameter C D, quadrati lineæ A,
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quæ eſt cum latere A, incommenſurabilis ex vltima 10.</
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">Cæterum lineam primò expoſitam, vt eſt in præ
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ſentia A, quod eſſet notæ quantitatis, Græci appella
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runt
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ideſt rationalem, quemadmodum Latini
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eam appellant.</
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">Linearum autem longitudine
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cum expoſita rationali A, aliæ ſunt, quæ tamen ſunt
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commenſurabiles eidem potentia, ideſt conſtituunt
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quadrata, quæ ſunt commenſurabilia quadrato ra
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tionali A, vt linea C D, cum ſit diameter quadrati li
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neæ A, quadratum exhibet, quod eſt duplum quadrati lineæ A, ex 47. primi,
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quadratum autem lineæ A, eſt nouem, igitur quadratum eius duplum erit
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octodecim, quadratum ſcilicet lineæ C D. octodecim autem, & nouem ſunt
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cõmenſurabilia
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communi vnitatis menſura, huiuſmodi lineæ dicuntur com
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menſurabiles potentia tantum, potentia. </
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illius.</
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<
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">Quæ igitur rationali propoſitæ ſunt commenſurabiles aliquo modo, ſiue
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longitudine, & potentia (
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enim commenſurabilis eſt longitudine,
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eſt etiam potentia) ſiue potentia ſolùm, rationales ipſæ quoque </
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