Viviani, Vincenzo
,
De maximis et minimis, geometrica divinatio : in qvintvm Conicorvm Apollonii Pergaei
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D M (cum latus rectum B F, vel duplum ſit, vel plus quàm duplum ad
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B D) ergo M N ipſo aggregato B D cum D M adhuc maior erit, vnde
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rectangulum ſub N M in M B, ſiue quadratum L M, maius erit
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primæ pri
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mi huius.</
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gulo ſub aggregato B D cum D M, in eadem M B, quibus communi ad-
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dito quadrato M D, erit quadratum L M cum M D, ſiue vnicum qua-
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dratum D L, maius rectangulo ſub B D cum D M in M B, vna cum qua-
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drato D M, ſiue maius vnico quadrato D B, quod prædicto
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æquale eſt, ſiue linea D L maior D B. </
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">Quare ſegmentum axis D B, non
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excedens dimidium recti lateris B F, eſt _MINIMA_ linearum ducibilium
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ex D ad Hyperbolæ peripheriam. </
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<
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">Præterea, quadratum A D ſuperat quadratum L M, eo exceſſu quo re-
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ctangulum B D G ſuperat rectangulum B M N, (ſunt enim ſingula
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primæ pri
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mi huius.</
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lis æqualia) ſed exceſſus rectanguli B D G ſupra rectangulum B M N ma-
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ius eſt rectangulo M D G, ergo quadratum A D ſuperat
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L M maiori rectangulo quàm M D G; </
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">ſed quadratum D L ſuperat idem
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quadratum L M quadrato D M, quod minus eſt rectangulo MDG (nam
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eſt D G maior D M, cum ſuperiùs demonſtrata ſit maior ipſa D B) ergo
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quadratum D A maius eſt quadrato D L, ſiue linea D A maior quacun-
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que D L, intercepta inter applicatam D A, & </
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<
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">Ampliùs, ducatur alia quæpiam D O ſupra D A, ſed remotior à ſe-
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gmento DB quàm D L, applicataque O P, producatur donec regulatrici
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E F occurrat in Q. </
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">Erit exceſſus quadrati O P ſupra quadratum L M,
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idem ac exceſſus rectanguli B P Q ſupra B M N (nam ſunt
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primæ pri
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mi huius.</
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quadratis æqualia, vtrumque vtrique) ſed exceſſus rectanguli B P Q ſu-
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pra B M N maior eſt rectangulo M P Q, ergo exceſſus quadrati O P,
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pra quadratum L M, maior eſt rectangulo ſub M P, & </
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quadrati M D ſupra quadratum D P, minor eſt prædicto rectangulo (nam
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quadratum M D ſuperat quadratum D P, rectangulo ſub M D cum
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">1. huius.</
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in M P, quod eſt minus rectangulo ſub Q P in eadem M P, quoniam
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M D cum D P minor eſt recto latere B F, & </
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<
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">eò minor ipſa QP,
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quę maior eſt B F) quare exceſſus quadrati O P ſupra L M,
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maior eſt exceſſu quadrati M D ſupra D P: </
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tur extrema ſimul quadrata O P, P D, ſiue vni-
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cum quadratum D O, maius eſt duobus ſi-
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mul quadratis medijs L M, M D, hoc
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eſt vnico quadrato D L, ſiue li-
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nea DO maior eſt linea DL.
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efficit angulum
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cum _MINI_-
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_M A_
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D B, minor eſt, &</
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fuit vltimò demon-
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ſtrandum. </
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* * *
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* *
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