Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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primum, ſed non ſunt æqualia, vt conſtat; </
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<
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bus motus eſſet æquabilis; igitur ſecundum eſt maius tertio, ita vt tamen
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ex vtroque tempus fiat æquale primo inſtanti. </
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Theorema
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64.
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Non decreſcunt illa inſtantia ſecundum lineam ſextam in extremam &
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mediam rationem propagatam; </
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<
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">ita vt primum ſit ad ſecundum, vt ſecundum
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ad tertium, tertium ad quartum, quartum ad quintum at que ita deinceps
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; </
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ſit enim aliqua ſeries numerorum, qui aliquo modo accedant ad prædi
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ctam proportionem 1.2.3.5.8.13.21.34.55. ſitque primum inſtans vlti
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mus numerus 55. ſecundum 34.tertium 21. atque ita deinceps: </
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ſecundum, & tertium adæquant primum; </
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ſextum nullo modo adæquant; </
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<
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">immò ne quidem eius ſubduplum, &
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multò minus 3. alij addito primo: </
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">immò ſi linea data duodecies propor
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tionaliter diuidatur, vltimum ſegmentum vix eſſet ſubcentuplum primi,
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vt conſtat; igitur reiici debet hæc propoſitio. </
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Theorema
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65.
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Inſtans primum non eſt ad ſecundum vt numerus ad numerum; </
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tertium, quartum, quintum, ſextum, &c.
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probatur, quia nullus numerus
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excogitari poteſt quo deſignari poſſit quantitas, ſeu perfectio, ſeu va
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lor iſtorum inſtantium; </
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<
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id
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">ſit enim primum inſtans ſecundum ſit 3/5. tertium
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2/5 quartum 4/9 quintum 2/9 ſextum 2/9. Equidem ſecundum, & tertium adę
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quant primum; </
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<
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id
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">adde quod non poteſt amplius ſeries propagari per nu
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meros rationales; </
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">ſit autem ſecundum (6/11) 3. (5/11) cum tribus aliis 4/9 1/9 7/9; </
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equidem ſi reducantur hæ 5. minutiæ, reſpondebunt his (54/99) (45/99) (44/99) (12/99) (26/99): </
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igitur ſecunda erit maior quarta; </
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<
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">at prima ſuperat ſecundam (9/999) ſecunda
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tertiam (1/99) tertia quartam (11/99) quarta quintam (12/99). Cur porrò hæc inæqua
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litas, igitur numeri poſſunt aſſignari; non poſſunt etiam poni in ſerie
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geometrica ſubdupla 1. 1/2 1/4 1/8 &c. </
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<
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primam idem dicendum eſt potiori iure de tribus aliis; </
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<
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rie arithmetica ſimplici 1. 1/2 1/3 1/4 2/5 1/6; quia ſecunda, & tertia ſunt mi
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nores prima 1/6, vt quarta, quinta, ſexta ſunt minores prima (26/74). </
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Theorema
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66.
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Datur aliquis ſeries numerorum irrationabilium, ſeu ſurdorum minorum, &
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minorum
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; quorum primus ita ſuperet ſecundum, ſecundus tertium,
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tertius quartum, &c. </
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<
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">vt ſecundus, & tertius adæquent primum, item
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quartus, quintus, ſextus. </
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<
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v. g. poteſt dari linea AG conſtans tribus partibus æqualibus, ſcilicet
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AB, BC, CG, & ſecunda BC duabus BD maiore, & DC minore, & ter
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tia tribus prima CE minore ED, ſed maiore EF, ſecunda EF maiore F
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G, atque ita deinceps; </
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<
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ſubdiuidetur in 4. partes, quarum prima ſit maior ſecunda, &
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tertia
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& hæc quarta, & omnes minores FG; </
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<
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id
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tes, vt differentia primæ, & ſecundæ ſit maior differentia ſecundæ, & </
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