Viviani, Vincenzo
,
De maximis et minimis, geometrica divinatio : in qvintvm Conicorvm Apollonii Pergaei
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">Similes Hyperbolæ per diuerſos vertices ſimul adſcriptæ, & </
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quarum eadem ſit regula, ſunt inter ſe nunquam coeuntes, & </
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<
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">in in-
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finitum productæ ad ſe propiùs accedentes, ſed ad interuallum
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nunquam perueniunt æquale cuidam dato interuallo.</
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<
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">SInt duæ Hyperbolæ ABC, DEF per diuerſos vertices B, E ſimul adſcri-
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ptæ, quarum eadem ſit regula GH (ſic enim
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ſimiles erunt,
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">6. ſecúd.
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defin.</
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ductis contingentibus BI, EL; </
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">eſt tranſuerſum GB ad rectum BI, vt tranſuer-
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ſum GE ad rectum EL.) </
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<
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">Dico primùm, has in infinitum productas, nun-
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quam ſimul conuenire.</
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http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/QN4GHYBF/figures/0103-01
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">Protracta enim contingente LE, ſectionem ABC ſecane in M, N, quæ
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erit ipſi ordinata, cum ſectiones ponantur ſimul adſcriptæ; </
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<
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">patet ſectionem
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DEF totam cadere infra contingentem MN. </
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<
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">Iam ſumpto in ſectione DEF
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quolibet puncto D, per ipſum ordinatim applicetur ADOH alteram ſectio-
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nem ſecans in A, regulam verò in H: </
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<
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">erit quadratum AO, ad quadratum
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DO, vt rectangulum BOH ad rectangulum EOH (ob ęqualitatem) vel
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1. huius.</
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altitudo BO ad altitudinem EO, ſed eſt BO maior EO, quare quadratum
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AO maius erit quadrato DO, ex quo punctum D cadit intra Hyperbolen
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ABC; </
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">& </
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<
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di ſectiones inter ſe nunquam conueniunt. </
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<
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">Iam ſi datæ Hyperbolæ, per verticem E, adſcribatur Hyperbole P E Q
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cuius latera ER, ES æqualia ſint lateribus BG, BI, vtrunque vtrique, ipſæ
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Hyperbolæ ABC, PEQ, congruentes erunt, eritque, (ob
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roll. 19. h.</
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RE ad ES, vt GB ad BI, vel vt GE ad EL, quare Hyperbolæ DEF, </
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