Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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Theorema
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16.
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Hinc non conſeruatur intactus impetus
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; </
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per æqualis; igitur haberet ſemper æqualem motum per Ax.3.l.2. igitur
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motus eſſet æquabilis, contra Th.15. </
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Theorema
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17.
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Hinc neceſſe eſt aliquid impetus destrui
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; </
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<
s
id
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">cum enim non remaneat inta
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ctus, & æqualis; nec fiat maior per Th.14. certè fit minor, igitur detra
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ctione aliqua per Ax.1.l.2. </
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Theorema
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18.
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Singulis inſtantibus aliquid deſtruitur impetus impreſſi
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; probatur quia
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cur potiùs vno quam alio? </
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de ſingulis. </
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Theorema
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19.
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Hinc neceſſariè eadem vel aqualis cauſa deſtructionis debet eſſe applicata
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;
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probatur, quia æqualis effectus æqualem cauſam ſupponit, per Ax.
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3. l. 2. </
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Theorema
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20.
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Illa cauſa non eſt tantùm aër ambiens vt volunt aliqui
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; </
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<
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id
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">quia licèt reſi
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ſtat motui, ſeu potius mobili, non tamen eſt ea reſiſtentia, quæ poſſit
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impetum tam citò deſtruere; </
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<
s
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">probatur primò, quia ſi hoc eſſet, deſtrue
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retur æquali tempore per omnem lineam ſurſum, quod eſt contra expe
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rientiam, vt dicemus infrà; </
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>
<
s
id
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">eſſet enim eadem cauſa applicata; </
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<
s
id
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">igitur idem
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& æqualis effectus; </
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<
s
id
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N19652
">probatur ſecundò, quia non deſtruit aër primum il
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lum gradum impetus naturalis acquiſiti, vt conſtat in motu deorſum, qui
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tamen eſt imperfectiſſimus; igitur non eſt ſufficiens ad deſtruendum im
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petum violentum, niſi longo tempore. </
s
>
<
s
id
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">Tertiò, globus ſursùm projectus
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aſcendit, & deinde deſcendit æquali tempore; </
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<
s
id
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">igitur ſaltem ſingulis in
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ſtantibus deſtruitur vnus gradus impetus violenti æqualis primo gradui
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innato; </
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>
<
s
id
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">atqui aër non poteſt vno inſtanti deſtruere impetum æqualem
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primo innato; alioqui non intenderetur motus naturalis. </
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<
s
id
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">Quartò, & hæc
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eſt ratio à priori, quotieſcumque ſunt in eodem mobili duo impetus ad
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oppoſitas lineas determinati, pugnant pro rata, vt demonſtrauimus l.1.
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Th. 149. 150. 152. & in toto Schol. & multis aliis paſſim; atqui conſer
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uatur ſemper impetus naturalis innatus per Sch. Th.152.n.6.l.1.per Th.
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9. & Schol.Th.14. & Th.73.l.2. </
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Theorema
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21.
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Illa cauſa non eſt entitas corporis mobilis, vel ipſa grauitas, diſtincta ſcili
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cet ab impetu innato ſi quæ eſt de quæ alias,
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probatur, quia non eſſet potior
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ratio cur vno inſtanti deſtruerentur duo gradus impetus, quàm 3. 4. 5.
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quippe grauitas exigeret deſtructionem omnium: præterea omnis impe
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tus deſtruitur ne ſit fruſtrà per Schol, Th.152. & Th.162.l.1. denique ſi </
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