Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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tertiæ, & hæc maior differentia tertiæ, & quartæ; atque ita deinceps, nec
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aliter res eſſe poteſt. </
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Theorema
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67.
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Hinc partes, quo fiunt minores, accedunt propiùs ad æqualitatem,
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v.g. BD,
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& DC accedunt propiùs ad æqualitatem quàm AB, BD, & DC, CE, pro
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piùs quàm CD, DB, & CE, EF, quàm EC, CD, atque ita deinceps, vt patet;
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hinc poſt aliquot inſtantia motus, æqualia ferè redduntur inſtantia, vt
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conſtat. </
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Theorema
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68.
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Hinc qua proportione decreſcunt instantia, decreſcit etiam perfectio
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impetus
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; </
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">quia temporibus æqualibus eadem cauſa neceſſaria æqualem ef
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fectum producit per Ax. tertium igitur inæqualem inæqualibus, per Ax.
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13. num.4. igitur minorem minore tempore; </
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">igitur minorem in eadem
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proportione, in qua tempus eſt; igitur qua proportione, &c. </
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Theorema
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69.
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Hinc vides quâm ſit neceſſaria illa diuerſa perfectio impetus, quam indi
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cauimus lib.
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1. hinc impetus productus ſecundo, & tertio inſtanti adæ
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quat impetum productum primo, quem etiam adæquat productus quar
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to, quinto, ſexto, item productus ſeptimo, octauo, nono; decimo, atque ita
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deinceps; </
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">hinc eſt eadem differentia impetuum, quæ
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; </
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gulis ſpatiis æqualibus primo ſpatio, quod percurritur primo inſtanti; </
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reſpondent ſingula inſtantia, & ſingulis inſtantibus ſinguli, & ſingulares
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impetus; </
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id
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">hinc non eſt quod primo inſtanti dicantur produci plura pun
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cta impetus in eodem puncto corporis grauis; </
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id
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">ſed vnicum tantùm pun
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ctum talis perfectionis ſcilicet phyſicum; cur enim potius duo puncta,
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quam tria? </
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">ſed quod vnum eſt determinatum eſt per Ax. 5. lib. 1. hinc
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optima ratio cur potius tali inſtanti producatur impetus talis perfectio
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nis quàm alterius? </
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<
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">quippe perfectio impetus ſequitur perfectionem in
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ſtantis quo producitur; </
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">hinc dicendum videtur omnia puncta impetus
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eſſe diuerſæ perfectionis, vel heterogenea; vt vulgò aiunt Philoſophi; </
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cuius rationem demonſtratiuam afferemus lib. ſequenti cum de motu
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violento; </
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<
s
id
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">hinc vides duplicem progreſſionem; </
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<
s
id
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">primam ſcilicet, qua ex
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ſuppoſitis temporibus æqualibus acquiruntur ſpatia inæqualia, de qua
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fusè ſuprà; </
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<
s
id
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">in hac enim velocitas eadem proportione cum impetu creſ
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cit, & cum ipſo tempore; </
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s
id
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">hoc eſt tempore triplo eſt tripla, quadruplo
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quadrupla; </
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s
id
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">item impetus in duplo tempore eſt duplus, in triplo triplus; </
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modò progreſſio fiat in temporibus primo inſtanti æqualibus; </
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<
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progreſſio eſt qua ex ſuppoſitis ſpatiis æqualibus tempora fluunt inæ
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qualia, hoc eſt minora & minora; </
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<
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id
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">quibus etiam reſpondet impetus im
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perfectior in eadem proportione temporum; prima fit per differentias
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æquales, & proportiones inæquales, ſecunda verò per differentias inæ
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quales, & proportiones inæquales. </
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