Viviani, Vincenzo
,
De maximis et minimis, geometrica divinatio : in qvintvm Conicorvm Apollonii Pergaei
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<
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<
s
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">CVm huiuſmodi ſolida portio E F G de quolibet prędictorum ſolidorum
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abſciſſa, ſit ſolidum ad alteram partem F deficiens, circa Acuminatũ
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planum E F G deſcriptum, cumque omnia plana eius baſi E H G I æquidi-
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ſtantia, ſint plana Acuminata, vt in prima proximè præcedentium definitio-
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15. Arch.
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de Conoi.
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&c.</
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num monuimus, ſintque omnia inter ſe ſimilia, ac ſimiliter poſita, eò quod vel ſint circuli, vel Ellipſes, quarum homologi axes ſunt eædem applicatæ in Acuminato E F G, idcircò per ſecundam prædictarum definit. </
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<
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">talis ſoli-
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15. ibid.</
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da portio in poſterum vocari poterit aliquandò ſolidum Acuminatum; </
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planum Acuminatum, ſeu portio plana E F G, cum ſit recta ad baſim E H
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G I, dicetur Canon rectus ſolidæ portionis.</
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<
s
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">EX hac elicitur, qua methodo per axem cuiuslibet Conoidis, aut Sphæ-
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roidis, vel Sphæræ, aut etiam Coni recti duci poſſit planum, quod ad
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datum quodcunque planum non per axem ductum, & </
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<
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">ſolidum ſecans, re-
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ctum ſit, etiam ſi ſecans planum in Conoide Parabolico, aut Hyperbolico,
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vel Cono non ſit circulus, neque Ellipſis: </
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<
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">ſimulque patet, quod prædictum
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planum per axem, aliud non per axem ductum omnino ſecat intra ſolidum:
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</
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s
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">quæ omnia, velleuiter perpendenti manifeſta ſunt ex dictis, quæque ab ip-
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ſo Archimede tanquam poſſibilia, & </
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<
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">iam nota paſſim ſupponuntur in libro
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de Conoid. </
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<
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s
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">POterat quidem prima pars huius Problematis breuiùs perſolui. </
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ex vertice B, vel ex quolibet alio axis puncto, ſuper planum ſe-
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cans E H G I ducta perpẽdiculari, per quàm, & </
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</
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<
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">conſtat hoc idem ſuper planum ſecans rectum eſſe. </
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<
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">Verùm cum ſæpe
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Elem.</
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niat, quod ipſa perpendicularis occurrat ſecanti plano non intra ſolidum,
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ſed vel in eius ſuperficie, vel extra, cumq; </
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<
s
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">omnino oſtendere opus ſit, quod
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huiuſmodi planum per axem, rectum ad planum ſecans, hoc idem planum
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ſecat ſemper intra ſolidum, idcircò prò huius Problematis ſolutione ſupe-
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riorem viam elegimus, quæ ad vtrunq; </
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ctione.</
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">COlligitur quoque planum, quod baſi portionis cuiuslibet prædicto-
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rum ſolidorum æquidiſtat, atque eius conuexam ſuperficiem con-
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tingit, eam contingere ad verticem diametri recti Canonis; </
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gere ad verticem axis portionis ſolidæ.</
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