Viviani, Vincenzo
,
De maximis et minimis, geometrica divinatio : in qvintvm Conicorvm Apollonii Pergaei
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E P K, minor S P Y, & </
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">in quauis figura ad E verticem màioris axis interio-
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rem ſectionem contingat recta A E C, quæ ad vtranque partem exterioris
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pertinget, ac bifariam ſecabitur in E. </
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<
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xml:space
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">Dico ipſam A E C eſſe
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45. huius.</
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exteriori ſectioni applicatarum, atque interiorem contingentium. </
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lipſibus contingentem R S T ad verticem minoris axis eſſe _MAXIMAM_.</
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<
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">Sit quæcunque alia contingens L D M ad punctum D, quæ item exte-
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riori ſectioui occurret in L, M, & </
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<
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">bifariam ſecabitur in D, & </
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<
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">per D
<
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xml:space
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">ibidem.</
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tur H D I ipſi A E C æquidiſtans, exteriori occurrens in H, I. </
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ſectione A B C per punctum D intra ipſam ſumptum, ſint duæ H D I, L D
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M, quarum prima maiori axi B G eſt perpendicularis, altera verò inclina-
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ta, erit rectangulum H D I minus rectangulo L D M, (cum ipſum H D I ſit
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_MINIMVM_ ) ſed H D I æquatur quadrato A E, ergo quadratum A
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minus erit rectangulo L D M, ſiue quadrato L D, & </
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plo minus, hoc eſt quadratum A C minus quadrato L M, ſiue contingens
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linea A C minor contingente A M, & </
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obliqua A M: </
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">quare A E C erit _MINIMA_ interiorem ſectionem contin-
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gentium. </
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">Iam, ducta ſit per D, recta V D X æquidiſtans contingenti R S T. </
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in Ellipſi A B C ſit per punctum D recta V D X minori axi O Q perpendi-
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cularis, ſitq; </
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<
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">erit rectangulum V D X maius rectangulo
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L D M (cum V D X ſit _MAXIMVM_) ſed V D X æquatur quadrato R
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quare quadratum R S maius erit rectangulo L D M, ſiue quadrato L D, & </
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quadruplum quadruplo maius, hoc eſt quadratum R T maius quadrato L
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M, hoc eſt linea R T maior linea R M, & </
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gente inter S, & </
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<
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contingentium. </
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