Descartes, René
,
Renati Des-Cartes principia philosophiae
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>Licet enim unamquamque mediam partem iſtius cl avi
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pro uno corpore numerare; cùmque iſta media pars
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manu noſtrâ ſit minor, videtur ejus vi debere poſſe
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moveri, atque ſic ab alià medià parte divelli. </
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<
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>Sed no
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tandum eſt manus noſtras eſſe admodum molles,
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ad naturam corporum fluidorum magis quàm duro
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rum accedentes; ideoque non totas ſimul agere ſolere
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in corpus ab iis movendum, ſed eam tantùm ipſarum
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partem, quae, corpus iſtud tangens, tota ſimul in illud
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incumbit. </
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>Quippe, ſicuti media pars clavi
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qua
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tenus ab aliâ ejus mediâ parte eſt dividenda, rationem
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habet unius corporis: ſic pars manûs noſtrae proximè,
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illam tangens, & ipſâ minor, quatenus à reliquis ejuſ
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dem manús partibus ſejungi poteſt, habet rationem
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alterius corporis. </
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>Et quia faciliùs à reliquâ
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po
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teſt ſeparari quàm pars clavi à reliquo clavo, & iſta
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ſeparatio ſine doloris ſenſu fieri nequit, ideò clavum
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ſerreum ſolâ manu frangere non poſſumus; ſed ſi
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illam malleo, limâ, forfice, aliove inſtrumento mu
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niamus, ut ita eius vis ad partem corporis dividendi,
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minorem corpore quo utitur, ad illud dividendum </
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LXIII.
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Cur quaedam corpora
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tam dura ſint, ut,
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quamvis parva, non
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facilè manibus no
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ſtris dividantur. </
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Nihil hîc addam de figuris nec quomodo ex earum
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infinitâ varietate motuum quoque varietates innu
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merae conſequantur, quia ſatis iila per ſe patebunt,
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ubicunque uſus veniet ut de ipſis agamus. </
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<
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>Et ſuppono
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meos lectores vel primò elementa Geometria jam no
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viſſe, vel ſaltem ingenium ſatis aptum habere ad Ma
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thematicas demonſtrationes intelligendas. </
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<
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profiteor me nullam aliam rerum
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mate
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riam agnoſcere, quàm illam omnimode diviſibilem, </
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