Viviani, Vincenzo
,
De maximis et minimis, geometrica divinatio : in qvintvm Conicorvm Apollonii Pergaei
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xml:space
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">MINIMA linearum in Hyperbola ducibilium ad ipſius pe-
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ripheriam à puncto axis intra ſectionem ſumpto, quod diſtet à
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vertice per interuallum, non maius quàm dimidium recti late-
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ris, eſt idem axis ſegmentum inter punctum, & </
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<
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ceptum. </
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ſtituit angulum minor eſt.</
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<
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">ESto Hyperbole A B C, cuius ſegmentum axis B D non excedat dimi-
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dium recti lateris B F (quod axi ordinatim applicetur, &</
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<
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D B eſſe _MINIMAM_ ducibilium ex ipſo puncto D ad Hyperbolæ peri-
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pheriam A B C, &</
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<
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<
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">Sumatur in directum axi, tranſuerſum latus B E, iungaturque regula E F,
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& </
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<
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in G.</
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<
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">Iam, cum in triangulo E D G, ſit D G maior B F, & </
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to B D (ex hypoteſi) erit D G eò maior ipſo ſegmento D B, quare re-
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ctangulum G D B, ſiue quadratum A D, maius erit quadrato D B; </
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primę pri.
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mi huius.</
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eſt linea D A maior ipſa D B.</
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<
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">Eodem modò, ac in Parabola, oſtendetur D A minorem eſſe quacun-
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que educta D H infra D A, & </
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<
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">Nunc verò ſit quælibet D L ducta ex D ſupra D A, & </
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tur L M, quę producatur, donec regulæ E F occurrat in N. </
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gulo E D G, recta M N maior B F, ſed B F maior eſt aggregato B D </
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