Huygens, Christiaan, Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica

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          <figure number="70">
            <image file="0125-01" xlink:href="http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/xxxxxxxx/figures/0125-01"/>
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        <div xml:id="echoid-div142" type="section" level="1" n="61">
          <head xml:id="echoid-head91" xml:space="preserve">VERA
            <lb/>
          CIRCULI ET HYPERBOLÆ
            <lb/>
          QUADRATURA
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          AUTHORE
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          JACOBO GREGORIO.</head>
          <head xml:id="echoid-head92" xml:space="preserve">LECTORI GEOMETRÆ
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          SALUTEM.</head>
          <p style="it">
            <s xml:id="echoid-s2662" xml:space="preserve">MEcum aliquando cogitabam, ami-
              <lb/>
            ce Lector, num Analytica cum
              <lb/>
            ſuis quinque operationibus eſſet
              <lb/>
            ſufficiens, & </s>
            <s xml:id="echoid-s2663" xml:space="preserve">generalis methodus
              <lb/>
            inveſtigandi omnes quantitatum
              <lb/>
            proportiones, ut in initio ſuæ Ge-
              <lb/>
            ometriæ affirmare videtur Car-
              <lb/>
            teſius; </s>
            <s xml:id="echoid-s2664" xml:space="preserve">ſi enim ita eſſet, poſſibile foret ejus ope to-
              <lb/>
            ties decantatam circuli quadraturam exhibere:
              <lb/>
            </s>
            <s xml:id="echoid-s2665" xml:space="preserve">cumque hæc mente revolverem, facile percepi ex
              <lb/>
            hactenus repertis circuli proprietatibus nullam poſſe
              <lb/>
            analyſin inſtitui tali ſtructuræ inſervientem: </s>
            <s xml:id="echoid-s2666" xml:space="preserve">dein-
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            de mihi alias quærenti incidit in mentem hujus ſe-
              <lb/>
            cunda, prima enim in circulo vulgo eſt cognita: </s>
            <s xml:id="echoid-s2667" xml:space="preserve">
              <lb/>
            ex hiſce percepi ſeriem polygonorum convergentem,
              <lb/>
            cujus terminatio eſt circuli ſector; </s>
            <s xml:id="echoid-s2668" xml:space="preserve">ubi ſtatim </s>
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