Cavalieri, Buonaventura
,
Geometria indivisibilibvs continvorvm : noua quadam ratione promota
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LIBER II.
"/>
modo oſtendemus nos poſſe ſic producere omnia plana figuræ, EA
<
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G, vt fiant maiora omnibus planis figuræ, GOQ, ita productis, & </
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xml:space
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">Diffin. 4.
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1. 5. Elem.</
note
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ſic deinceps; </
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<
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xml:space
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">ergo omnia plana ſolidarum figurarum, EAG, GO
<
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Q, ſunt magnitudines inter ſe rationem habentes, quod oſtendere
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opus erat.</
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<
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xml:space
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head
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<
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<
s
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xml:space
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">_P_Oſſet fortè quis circa hanc demonſtrationem dubitare, nonrectè per-
<
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cipiens quomodo ind finitæ numero lineæ, vel plana, quales eſſe
<
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/>
exiſtimari poſſunt, quæà me vocantur, omnes linea, vel omnia plana
<
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talium, vel talium figurarum poſſint ad inuicem comparari: </
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>
<
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xml:space
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">Propter
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quod innuendum mihi videtur, dum conſidero omnes lineas, vel omnia
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plana alicuius figuræ, me non numerum ipſarum comparare, quem igno-
<
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ramus, ſed tantum magnitudinem, quæ adæquatur ſpatio ab eiſdem li-
<
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neis occupato, cum illi congruat, & </
s
>
<
s
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xml:space
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">quoniam illud ſpatium terminis
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comprehenditur, ideò & </
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<
s
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xml:space
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">earum magnitudo eſt terminis eiſdem compre-
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henſa, quapropter illi poteſt fieri additio, vel ſubtractio, licet numerum
<
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earundem ignoremus; </
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<
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xml:space
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">quod ſufficere dico, vt illa ſint ad inuicem compa-
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rabilia, alioquin neque ipſa ſpatia figurarum eſſent ad inuicem compa-
<
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rabilia: </
s
>
<
s
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xml:space
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">Vel enim continuum nihil ali ud eſt pręter ipſa indiuiſibilia, vel
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aliquid aliud, ſi nihil eſt præter indiuiſibilia, profectò ſi eorum conge-
<
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ries nequit comparari, neque ſpatium, ſiue continuum, erit comparabi-
<
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le, cum illud nihil aliud eſſe ponatur, quam ipſa indiuiſibilia: </
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<
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xml:space
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">Si Verò
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continuum eſt aliquid aliud præter ipſa indiuiſibilia, fateri æquum eſt hoc
<
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aliquid aliud interiacere ipſa indiuiſibilia, habemus ergo continuum,
<
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diſſeparabile in quædam, quæ continuum componunt, numero adbuc in-
<
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definita, inter quælibet enim duo indiuiſibilia æquum eſt interiacere ali-
<
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quid illius, quod dictum eſt eſſe aliquid aliud in ipſo continuo præter in-
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diuiſibilia, qua enim ratione tolleretur à medio duarum, à medijs quo-
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que oæterarum tolleretur; </
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<
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xml:space
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">hoc cum ita ſit comparare nequibimus ipſa,
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continua, ſiue ſpatia adinuicem, cum ea, quæ colliguntur, & </
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<
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xml:space
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lecta comparantur, ſcilicet, quæ continuum componunt, ſint numero in-
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definita, abſurdum, autem eſt dicere coutinua terminis comprehenſa non
<
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eſſe ad muicem comparabilia, ergo abſurdum eſt dicere congeriem om-
<
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nium linearum ſiue planorum, duarum quarumlibet figurarum non eſſe
<
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ad inuicem comparabilem, non obſtante, quod quæ colliguntur, & </
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<
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">il-
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lam congeriem componunt ſint numero indefinita, veluti hoc non obſtat
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in continuo, ſiue ergo continuum ex indiuiſibilibus componatur, ſiue,
<
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non, indiuiſibilium congeries ſunt adinuicem comparabiles, & </
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<
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tionem habent.</
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