Viviani, Vincenzo
,
De maximis et minimis, geometrica divinatio : in qvintvm Conicorvm Apollonii Pergaei
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<
s
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xml:space
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">Ampliùs dico ipſam DEF quò longiùs aberit à vertice E infra EA, eò
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magis appropinquare ſectioni B A M. </
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<
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xml:space
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">quoniam ducta D M parallela ad
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OEB, & </
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<
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xml:space
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">MN ad DO, fiet parallelogrammum DN, cuius oppoſita latera
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MN, DO æqualia erunt: </
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<
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">Itaqueregulæ IG occurrat producta MN in Q, & </
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regulæ LH producta DO in R: </
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<
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xml:space
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">cum ſit oſtenſa MN æqualis DO, erit qua-
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dratum MN ſiue rectangulum BNQ, æquale quadrato DO ſiue
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1. huius.</
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<
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">ibidem.</
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lo EOR: </
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<
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xml:space
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">ſed in triangulis IBG, LEH ſunt latera IB, LE, & </
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<
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">BG, EH inter ſe
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æqualia, alterum alteri, quapropter æqualium rectangulorum BNQ, EOR
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latera BN, & </
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<
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">EO æqualia erunt: </
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<
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">quare cum diametri ſegmenta BN,
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">43. h.</
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ſint æqualia, facta proſtaphereſi, proueniet BE æqualis NO, ſed eſt quoque
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MD æqualis NO in parallelogrammo DN, igitur rectæ BE, & </
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<
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">MD inter ſe
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ſunt æquales, at ſunt etiam parallelæ, ergo coniuncta BM iunctæ ED æqui-
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diſtat, ſed BM ſecat NM, quare producta ſecabit quoque OD, ſed extra ſe-
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ctionem BMA (cum BM ſit intra ſectionem, producta verò tota cadat extra)
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ſitque occurſus in P, & </
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<
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">OD occurrat ſectioni BMA in S, PM verò contin-
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gentem EA ſecet in T; </
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<
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xml:space
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">& </
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<
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xml:space
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">in ſecunda figura, in qua punctum A cadit inter
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puncta S, & </
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">M, iungatur SM, quæ cum tota cadat intra ſectionem, neceſſa-
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riò ſecabit applicatam AE: </
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<
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<
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</
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<
s
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">Iam, in prima figura, cum in parallelogrammo P E oppoſita latera ET,
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DP ſint æqualia, ſitque EA maius ET, erit EA quoque maius ipſo DP, ſed
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eſt DP maius intercepto applicatæ ſegmento DS, erit ergo AE, eò maius
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ipſo DS. </
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<
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xml:space
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">In ſecunda autem figura cum pariter ET, DP ſint æquales, ſitque
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dempta TV minor dempta PS, erit reliqua EV maior reliqua DS, & </
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<
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gis EA maior eadem DS. </
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<
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xml:space
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">Eodè penitùs modo oſtendetur, quamlibet aliam
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interceptam ZY infra SD minorem eſſe ipſa SD: </
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<
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xml:space
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">nam ducta YZ æquidiſtan-
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ter ad EB, demonſtrabitur item YZ æqualem eſſe eidem BE, ac ideo YZ, & </
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DM eſſe inter ſe ęquales, & </
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<
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<
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">ex quo ſi iungantur MZ, & </
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æquales erunt, & </
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<
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<
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">completa igitur conſimili conſtructione, ac ſu-
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pra, idem omnino inſequetur, hoc eſt interceptam YX minorem adhuc eſſe
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DS: </
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<
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">tales ergo interceptæ quò magis à tangente EA remouentur continuè
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decreſcunt. </
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<
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">Quare ſectiones ABC, DEF ſunt ſemper ſimul accedentes.
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</
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<
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">Præterea, ſi ad euitandam in hiſce figuris linearum implicationem, con-
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cipiatur circumſcriptæ Hyperbolæ ABC centrum eſſe I, aſymptoton IG, & </
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contingens ex vertice BG; </
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<
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">at inſcriptæ DEF centrum L, aſymptoton LH,
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contingens autem ex vertice ſit EH: </
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<
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">cum harum ſectionum latera ſint data
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æqualia, erunt quoque ipſorum rectangula inter ſe æqualia, ideoque, & </
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<
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rum ſubquadrupla hoc eſt quadrata contingentium BG, EH, vnde ipſæ
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">1. ſecú-
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diconic.</
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neæ BG, EH æquales erunt, ſed eſt etiam BI æqualis EL (nam vtra eſt dimi-
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dium æqualium verſorum laterum) quare in triangulis IBG, LEH, cum ſint
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latera IB, BG, lateribus LE, EH æqualia, & </
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<
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">anguli ad B, E æquales, etiam
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anguli ad baſes I, L æquales erunt, vnde aſymptoti IG, LG inter ſe æqui-
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diſtant; </
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<
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">& </
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<
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">cum ſit à puncto L, quod eſt intra angulum ab aſymptotis cir-
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cumſcriptæ ſectionis factũ, ducta LH alteri aſymptoto IK æquidiſtans, pro-
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ducta ſecabit omnino Hyperbolen ABC: </
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<
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">quare LH aſymptotos
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ſecat Hyperbolen circumſcriptam; </
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<
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2 1 3: </
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<
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