Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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in qualibet parte minoris, quot ſunt in qualibet parte minoris; </
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<
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">haud
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dubiè impetus maioris habet eandem rationem ad impetum minoris;
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quam habet maius ad minus. </
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Collorarium
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5.
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<
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">Hinc quoque ducitur manifeſta ratio ſeu reſponſio ad illud præcla
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rum certè quorundam philoſophorum
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commẽtum
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, qui volunt ex mini
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ma ponderis acceſſione totam terræ molem inclinari, vt in nouo æqui
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librio ſtatuatur; quod omninò falſum eſt; </
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<
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">nam ex ſuppotione quòd
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terra non grauitet (vt vulgò dicitur, & aliàs à nobis
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demõſtrabitur
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) illa
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certè moueri non poteſt niſi producantur tot partes impetus quot ſunt
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partes ſubiecti in tota terra; quæ certè maximas
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potẽtiæ
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vires poſtulant. </
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Theorema
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34.
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Primo inſtanti, quo est impetus, non est ille motus, cuius hic impetus eſt
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cauſa.
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<
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"> Probatur; </
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<
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">quia non poteſt eſſe motus, niſi ſit locus prior reli
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ctus, & nouus acquiſitus, igitur ſi eodem inſtanti, quo eſt impetus,
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haberet motum, eodem inſtanti eſſet in duobus locis, quod dici non
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poteſt; & iam diximus in Th. 26. igitur impetus primo inſtanti quo
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eſt non habet ſuum motum. </
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Theorema
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35.
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Immò nihil eſt, quod primo inſtanti, quo eſt, moueri poſſit.
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<
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"> Quia non poteſt
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moueri, niſi acquirat nouum locum, & priorem relinquat; </
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<
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">igitur, vel ſi
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mul in vtroque eſt, quod dici non poteſt; </
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<
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">vel in relicto antè fuit; igitur
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non eſt primum inſtans, contra ſuppoſitionem. </
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Theorema
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36.
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Potest impetus aliquo inſtanti non moueri quo mouetur ipſum mobile, in
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quo est.
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</
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<
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"> Nam moueatur mobile quodlibet; </
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">& dum mouetur, impella
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tur, factâ ſcilicet acceſſione noui impetus; haud dubiè hoc primo in
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ſtanti, quo producitur impetus in dato mobili non mouetur per Th.
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35. quo tamen inſtanti mouetur prædictum mobile. </
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Collorarium
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1.
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<
s
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">Hinc egregium paradoxon;
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Poteſt alique inſtanti moueri ſubiectum, licèt
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non moueantur illa omnia, que eidem ſubiecto reuerâ inſunt.
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Corollarium
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2.
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<
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">Hinc etiam aliud paradoxon; </
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Impetus primo inſtanti, quo eſt, non habet
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ſuum finem, nec habere poteſt
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; patet, quia primo inſtanti non habet
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. </
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Corollarium
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3.
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<
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<
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">Hinc poteſt aliquid dato inſtanti carere ſuo fine; </
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>
<
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">licèt non ſit fruſtrà;
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fruſtrâ enim tantùm dicitur ille impetus, qui pro inſtanti ſequenti
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non poteſt habere motum. </
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Theorema
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37.
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Impetus pars recepta in parte ſubiecti non exigit motum aliarum partium
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