Cavalieri, Buonaventura
,
Geometria indivisibilibvs continvorvm : noua quadam ratione promota
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LIBER VII.
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riter inſiſtunt, eidẽ,
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LI, æquidiſtare, ex
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quo concludemus
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hæc omnia pariter
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in ſuperficie cylin-
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dracea coextendi,
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quæ ſit, ACNR,
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qua methodo pate
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bit etiam ſuperficiẽ,
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BSOD, eſſe cylin-
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draceam, in qua
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quidem iacent late-
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ra rectangulorũ prę-
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dictis oppoſita. </
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ſi ducta intelligan-
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tur oppoſita plana
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ſolidum, AO, tan-
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gentia, ac præfatis
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ſecantibus planis æ-
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quidiſtantia, contin-
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gere poteſt, vt ipſo-
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rũ planorũ cõtactus ſit ex vtraq; </
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<
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">parte, vel in puncto, vel in linea, vel
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in plano, vel ex vna parte contactus in vno iſtorum, ex altera verò
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in alio promiſcuè, vt conſideranti facilè innoteſcet, attamen quo-
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modocunq; </
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">res ſe habeat etiam ratione iſtorum contactuum fiet,
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vt dictum ſolidum cylindraceis ſuperficiebus comprehendatur, ſi
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enim contactus ex neutra parte fiat in plano, dictum ſolidum non
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alijs ſuperficiebus cylindraceis, quam ijs, quæ dictæ ſunt compre-
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hendetur, vt manifeſtum eſt, ſi vero contactus ſit in plano, illud
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erit parallelogrammum rectangulum, vt, AD, RO, cum enim
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hæc tangentia plana æquidiſtent planis ſecantibus, quę tranſeunt
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per latera cylindrici, cuius, ACNR, BDOS, ſunt ſuperficies, etiam
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ipſa per eiuſdem latera tranſibunt, ergo, AC, BD, ſicut etiam, R
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N, SO, per quæ tranſeunt dicta tangentia plana, ipſis, EG, FH, æ-
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quidiſtabunt, quo pacto oſtendemus etiam, AB, CD, RS, NO, ipſi,
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EF, GH, pariter æquidiſtare, ergo plana contactuum, AD, RO,
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erunt parallelogramma rectangula, ergo & </
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cylindraceæ, ergo etiam ratione contingentium planorum ſecan-
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tibus planis æquidiſtantium præfatũ ſolidũ ſuperficiebus cylindra-
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ceis comprehendi manifeſtum eſt, quod oſtendere opus erat.</
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