Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  dem recta per medium omnium
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                  Eq, eQ, MK
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                  ; (per Lem. </s>
                  <s>XXIII)
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                  & medium rectæ
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                  MK
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                  eſt centrum Sectionis. </s>
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                <p type="margin">
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                  DE MOTU
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                  CORPORUM</s>
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                  PROPOSITIO XXVII. PROBLEMA XIX.
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                  Trajectoriam deſcribere quæ rectas quinque poſitione datas continget.
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                <p type="main">
                  <s>Dentur pofitione tangentes
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                  ABG, BCF, GCD, FDE, EA.
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                  Figuræ quadrilateræ ſub quatuor quibuſvis contentæ
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                  ABFE
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                  dia­
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                  gonales
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                  AF, BE
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                  biſeca, & (per Corol. </s>
                  <s>3. Lem. </s>
                  <s>XXV) recta
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                  MN
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                  per puncta biſectionum acta tranſibit per centrum Trajectoriæ. </s>
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                  Rurſus Figuræ quadrilateræ
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                  BGDF,
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                  ſub aliis quibuſvis quatuor
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                    <figure id="id.039.01.114.1.jpg" xlink:href="039/01/114/1.jpg" number="60"/>
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                  tangentibus contentæ, diagonales (ut ita dicam)
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                  BD, GF
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                  bi­
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                  ſeca in
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                  P
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                  &
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                  Q:
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                  & recta
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                  PQ
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                  per puncta biſectionum acta tranſ­
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                  ibit per centrum Trajectoriæ. </s>
                  <s>Dabitur ergo centrum in concurſu bi­
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                  ſecantium. </s>
                  <s>Sit illud
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                  O.
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                  Tangenti cuivis
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                  BC
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                  parallelam age
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                  KL,
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                  ad eam diſtantiam ut centrum
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                  O
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                  in medio inter parallelas locetur,
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                  & acta
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                  KL
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                  tanget Trajectoriam deſcribendam. </s>
                  <s>Secet hæc tan-</s>
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