Ceva, Giovanni
,
Geometria motus
,
1692
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quadratum eſſet, porrò in eius auuerſa eſſet poteſtas appli
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catarum quadratica, & abſciſſarum quadratocubica. </
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DEMONSTRATIO.
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Tab.
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3.
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Fig.
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3.</
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AE ad ED ſit in ſeptuplicata ratione logarithmicæ
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rationis A ad B, at DC ad AB in quintuplicata, videlicet
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quadratocubus ex AE ad quadratocubum ex DE eandem
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habeat rationem, ac quadratoquadratocubus ex DC ad
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ſimilem poteſtatem ex AB; Dico in auuerſa figura poteſta
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tem aplicatarum eſſe quadratum, cuius
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2 eſt dif
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ferentia exponentium poteſtatum hyperbolæ; poteſtatem
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verò abſciſſarum eandem eſſe, abſciſſarum eiuſdem hyper
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bolæ. </
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& CDE &, hoc eſt, ſit vt poteſtas ex A, cuius exponens </
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eſt differentia exponentium poteſtatum hyperbolæ ad ſi
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milem poteſtatem ex B, & ideo FK ad KI erit duplicata ip
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ſius A ad B, ſed DC ad AB eiuſdem illius logarithmicæ
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quintuplicata; eſtque in hac eadem ratione etiam GF ad
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IH; ergo cum duplicata huius ſit ſimilis quintuplicatæ KF
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ad KI (nam vtraque ratio continet decies A ad B) pater,
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quadratum ex FG ad quadratum ex IH eſſe eam poteſta
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tem, quam propoſuimus euenire in applicatis auuerſæ, cum
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aliàs in abſciſſis ſit vtrobique poteſtas eadem, nempe qua
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dratocubi. </
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Pr.
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14.
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huius.
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Corollarium.
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Patet ex noto trilineo, vel parabola FGK eſſe in auuerſa,
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ſcilicet in hyperbola & BAE & (quæ tunc eſt ſemper magnitu
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dine finita iuxta aſsymptoton EM &) poteſtatem
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,
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qua pro exponente habet ſummam exponentium poteſtatum
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parabolæ, aut trilinei; nam cum eßet in trilineo pracedenti
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