Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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              tate conjunctim; & ſimiliter Reſiſtentis reactio æſtimetur conjun­
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              ctim ex ejus partium ſingularum velocitatibus & viribus reſiſtendi
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              ab earum attritione, cohæſione, pondere, & acceleratione ori­
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              undis; erunt actio & reactio, in omni inſtrumentorum uſu,
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              ſibi invicem ſemper æquales. </s>
              <s>Et quatenus actio propagatur per
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              inſtrumentum & ultimo imprimitur in corpus omne reſiſtens,
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              ejus ultima determinatio determinationi reactionis ſemper erit
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              contraria.
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              </s>
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              DE MOTU
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              CORPORUM</s>
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                  DE
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                  MOTU CORPORUM
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                  LIBER PRIMUS.
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                  SECTIO I.
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                  </s>
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                    <emph type="italics"/>
                  De Methodo Rationum primarum & ultimarum, cujus ope ſequentia
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                  demonſtrantur.
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                    <emph.end type="center"/>
                  </s>
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                <p type="main">
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                  LEMMA I.
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                  </s>
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                  QUantitates, ut & quantitatum rationes, quæ ad æqualitatem
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                  tempore quovis finito conſtanter tendunt, & ante finem tempo­
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                  ris illius propius ad invicem accedunt quam pro data quavis diffe­
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                  tia, fiunt ultimo æquales.
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                  </s>
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                  <s>Si negas; fiant ultimò inequales, & ſit earum ultima differentia
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                    <emph type="italics"/>
                  D.
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                  Ergo nequeunt propius ad æqualitatem accedere quam pro
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                  data differentia
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                  D:
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                  contra hypotheſin. </s>
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            </subchap1>
          </chap>
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