Viviani, Vincenzo
,
De maximis et minimis, geometrica divinatio : in qvintvm Conicorvm Apollonii Pergaei
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in ipſa DEF, quocunque puncto D, per ipſum ordinatim applicetur ODS,
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alteram ſectionem ſecans in S: </
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<
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">erit quadratum SO æquale rectãgulo
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& </
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<
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">quadratum DO rectangulo OEH, ſed rectangulum OBG maius eſt rectã-
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gulo OEH, cum latitudo BG æqualis ſit EH, altitudo verò BO maior EO,
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quare SO quadratum, maius eſt quadrato DO; </
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<
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Parabolen BA, & </
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modi ſectiones inter ſe nunquam conueniunt. </
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<
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ſe propiùs accedere: </
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<
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">per M applicata
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MN, fiet parallelogrammum DN, cuius oppoſita latera MN, DO æqualia
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erunt. </
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<
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DO, ſiue rectangulo OEH, ſed horum latera BG, EH æqualia ſunt,
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& </
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">itaque per proſtaphereſim, erit BE æqualis
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NO, ſed eſt quoque MD æqualis eidem NO, igitur BE, & </
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æquales, at ſunt quoque parallelæ, igitur coniunctæ BM, & </
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erunt, & </
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">parallelæ, ſed BM ſecat NM, quare producta ſecabit quoque alte-
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ram parallelarum OD, ſed extra ſectionem BMA (cum ſit BM intra ſectio-
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nem, producta verò, tota cadat extra) ſit ergo occurſus cum ODS in P, & </
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cum contingente EA in T; </
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inter applicatas MN, OS, iungatur SM ſecans EA in V.</
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<
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">Iam in prima figura, cum in parallelogrammo PE latera ET, DP, ſint æ-
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qualia, ſitque EA maius ET, erit EA quoque maius DP, eſtque DP maius
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intercepto ſegmento DS, quare AE, eò maius erit ipſo DS. </
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<
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tem figura, cum pariter ET, DP ſint æquales, ſitque ablata TV minor abla-
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ta PS, erit reliqua EV maior reliqua DS, & </
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<
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norem eſſe ipſa SD; </
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YZ æqualis eidem BE, ideoque YZ, & </
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