Descartes, René
,
Renati Des-Cartes principia philosophiae
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conſervat, nullà habitâ ratione ejus qui fortè fuit paulò
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antè. </
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>Ac quamvis nullus motus fiat in inſtanti, mani
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feſtum tamen eſt omne id quod movetur, in ſingulis
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inſtantibus quae poſſunt deſignari dum movetur, de
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terminatum eſſe ad motum ſuum
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ver
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ſus aliquam partem, ſecundúm lineam rectam, non
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autem unquam ſecundúm ullam lineam curvam. </
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>Ut,
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exempli cauſâ, lapis
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A, in fundâ EA per
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circulum A B
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rota
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tus, eo inſtanti, quo
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eſt in puncto A, de
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terminatusquidem eſt
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ad motum verſus ali
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quam partem,
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ſecundùm lineam re
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ctam verſus C, ita
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ſcilicet ut linea recta
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AC ſit tangens cir
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culi. </
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poteſt illum determinatum eſſe ad ullum motum
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curvum: etſi enim priús venerit ex L ad A per li
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neam curvam, nihil tamen iſtiu's curvitatis intelligi
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poteſt in eo remanere, dum eſt in puncto A. </
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etiam experientiâ confirmatur, quia ſi tunc è
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egrediatur, non perget moveri verſus B, ſed verſus
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C. </
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>Ex quo ſequitur, omne corpus quod circulariter
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movetur, perpetuò tendere ut recedat à centro cir
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culi quem deſcribit. </
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<
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>Ut ipſo manûs ſenſu experimur
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in lapide, dum illum fundâ circumagimus. </
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conſideratione iſtâ in ſequentibus ſaepe utemur, </
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