Descartes, René
,
Renati Des-Cartes principia philosophiae
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videmus illas eum non impedire. </
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>Nam ſi, exempli
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cauſà, corpus durum B moveatur verſus C, ac quae
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dam ex partibus fluidi in
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termedii D ferantur in con
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trarium à C verſus B,
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motum eius non juvabunt,
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ſed contrà magis impe
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dient, quàm ſi plan eſſent
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ſine motu. </
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>Quae difficultas ut ſolvatur, recordandum
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eſt, non motum, ſed quietem eſſe motui contrariam; &
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motûs determinationem verſus unam partem eſſe con
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trariam ejuſdem determinationi verſus partem oppo
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ſitam, ut iam dictum eſt a; itemque omne id quod
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movetur, tendere ſemper ut pergat moveri ſecundùm
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lineam rectam b. </
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>Ex his enim patet: primò,
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du
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rum B, dum quieſcit, magis opponi, ſuà illâ quiete,
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motibus particularum corporis fluidi D ſimul ſpecta
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tis, quàm iiſdem opponeretur ſuo motu, ſi moveretur. </
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Ac deinde, quantum ad determinationem, verum qui
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dem eſt tot eſſe ex particulis ipſius D, quae
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à C verſus B, quot ſunt quae moventur in contrarium:
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quippe epedem ſunt quae, venientes à C, impingunt in
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ſuperficiem corporis B, ac deinde retorquentur ver
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ſus C. </
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>Et quidem ſingulae ex iſlis ſeorſim ſpectatae, im
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pingentes in B, pellunt ipſum verſus ſ, atque
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ma
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gis impediunt, ne moveatur verſus C, quàm ſi eſſent
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ſine motu; ſed, quia totidem etiam ab F tendunt in B,
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illudque pellunt verſus C, idcirco, quantum ad hoc
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attinet B non magis pellitur verſus unam partem </
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