Ceva, Giovanni, Geometria motus, 1692

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              tionem, ac GF ad IH, motus, qui fiunt iuxta illas geneſes,
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              vocentur inter ſe ſimiles, & ipſæ geneſes dicentur ſimilium
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              motuum; quod verò attinet ad rectas AE, BD, GF, IH apel­
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              labimus applicatas ad homologa puncta A, B, G, I propor­
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              tionales. </s>
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            <p type="main">
              <s id="s.000178">
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              PROP. VI. THEOR. VI.
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              <s id="s.000179">SI in imaginibus temporum homogeneis, applicatæ v­
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              nius fuerint ad homologa puncta, proportionales ap­
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              plicatis alterius imaginis, motus, quorum ſunt ipſæ imagi­
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              nes, ſimiles erunt. </s>
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            <p type="main">
              <s id="s.000180">Imagines temporum ſint &MLABC, &ONGIK, quæ </s>
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              ſint homogeneæ, & cum GI ad IK ſit vt AB ad BC, habeat
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              quoque AL ad BM eandem rationem, ac GN ad IO. Di­
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              co, motus, quorum ſunt illæ imagines temporum inter ſe ſi­
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              miles eſſe. </s>
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            <p type="margin">
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              Tab.
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              2.
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              fig.
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              3.</s>
            </p>
            <p type="main">
              <s id="s.000183">Sint apud ipſas imagines eorundem motuum geneſes,
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              ſcilicet EAC, FGK interſe homogeneæ. </s>
              <s id="s.000184">Exiſtente AL ad
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              BM, vt GN ad IO, erit conuertendo BM ad AL vt IO ad
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              GN; ſed vt BM ad AL ita ob geneſim EA ad DB, & vt IO
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              ad GN, ſic FG ad HI. ergo EA ad DB eſt vt FG ad HI, erat
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              autem vt AB ad BC ita etiam GI ad IK, ergo motus ſunt
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              ſimiles, & ipſæ imagines ſimilium motuum. </s>
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            <p type="margin">
              <s id="s.000185">
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              Def.
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              2.
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              huius.
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              </s>
            </p>
            <p type="margin">
              <s id="s.000186">
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                <emph type="italics"/>
              Def.
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              7.
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              huius.
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              </s>
            </p>
            <p type="main">
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              PROP. VII. THEOR. VII.
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              </s>
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            <p type="main">
              <s id="s.000188">SI in imaginibus velocitatum vnius, applicate fuerint ex
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              punctis homologè ſumptis proportionales applicatis
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              alterius imaginis, motus iuxta ipſas imagines erunt ſimi­
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              les, ideoque ipſæ imagines ſimilium motuum. </s>
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            <p type="margin">
              <s id="s.000189">
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                <emph type="italics"/>
              Tab.
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              2.
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              fig.
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              4.</s>
            </p>
            <p type="main">
              <s id="s.000190">Velocitatum imagines ſint ABCD, NPRT, ſitque AB
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              ad EF in eadem ratione, in qua NP ad TR; Dico exiſtenti­
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              bus etiam BF ad FC, vt PQ ad QR eſſe propoſitas imagi­
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              nes ſimilium motuum. </s>
              <s id="s.000191">Intelligantur eorundem motuum </s>
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