Ceva, Giovanni, Geometria motus, 1692

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              <s id="s.000761">
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              Scholium.
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              Vides, quàm breuiter rei diſficillimæ demonſtrationem at­
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              tulimus, nec dubium, quin illa extendi queat ad quaſcum­
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              que lineas decurſuum, dummodo ſimiles, ac ſimiliter poſitas in
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              ijſdem, vel æqualibus ab horizonte planis elenatis, quemad­
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              modum Dominus Viuianus pulcherrimè propoſuit.
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              Exemplum III.
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              PROP. XXXV. THEOR. XXVIII.
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              <s id="s.000765">TEmpora lationum à quiete per plana eandem eleua­
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              tionem habentia ſunt homologè vt longitudines
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              planorum. </s>
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              Tab.
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              8.
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              fig.
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              3.</s>
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              <s id="s.000767">Sint plana AB, AC eandem eleuationem AD habentia.
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              <s id="s.000768">Dico tempus lationis per AC ad id per AB eſſe vt AC ad
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              AB. (hæc Torricellij propoſitio,
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              eſt, hancque
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              eandem veritatem ex noſtris principijs demonſtrare
                <expan abbr="visũ">visum</expan>
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              eſt, non vt de re illa dubitemus, immò contrà, quòd de eą
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              plenè ſatisfacti ſimus, ex eo rurſus demonſtrandam ſuſce­
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              pimus, vt exinde methodus noſtra, quàm vera ſit, eluceſ­
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              cat) Momentum deſcenſus inplano AC ad id deſcenſus ſu­
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              per plano AB eſt vt AB ad AC; ſunt autem
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              grauium, etiam ſuper planis inclinatis motus, quos ſimpli­
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              ces appellamus, inter ſe ſimiles, nempe quorum geneſes
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              ſunt rectangula; ergo habebimus ſimplices geneſes, vnam,
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              cuius altitudo AC amplitudoque AB; alteram, cuius am­
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              plitudo AC, altitudo autem AB; itaque propoſitis ſpatijs
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              AC, AB, primiſque velocitatibus AB, AC, ſi fiat AB ad AC
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              vt CA ad EA, erit EA ad AB duplicata
                <expan abbr="tẽporum">temporum</expan>
              , & ideo
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              ratio temporum per AC, AB erit CA ad AB. </s>
              <s id="s.000769">Quod &c. </s>
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