Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  LIBER
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                  SECUNDUS.</s>
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                  DE
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                  MOTU CORPORUM
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                  LIBER SECUNDUS.
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                  SECTIO I.
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                  De Motu Corporum quibus reſiſtitur in ratione
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                  Velocitatis.
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                    <emph.end type="center"/>
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                  PROPOSITIO I. THEOREMA I.
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                  Corporis, cui reſiſtitur in ratione velocitatis, motus ex reſiſtentia
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                  amiſſus eſt ut ſpatium movendo confectum.
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                    <emph.end type="center"/>
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                  <s>NAm cum motus ſingulis temporis particulis æqualibus amiſſus
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                  ſit ut velocitas, hoc eſt, ut itineris confecti particula: erit,
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                  componendo, motus toto tempore amiſſus ut iter totum.
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                  Q.E.D.
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                  Corol.
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                  Igitur ſi corpus, gravitate omni deſtitutum, in ſpatiis libe­
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                  ris ſola vi inſita moveatur; ac detur tum motus totus ſub initio, tum
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                  etiam motus reliquus poſt ſpatium aliquod confectum: dabitur ſpa­
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                  tium totum quod corpus infinito tempore deſcribere poteſt. </s>
                  <s>Erit
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                  enim ſpatium illud ad ſpatium jam deſcriptum, ut motus totus ſub
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                  initio ad motus illius partem amiſſam. </s>
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                  LEMMA I.
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                  Quantitates differentiis ſuis proportionales, ſunt continue propor­
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                  tionales.
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                  <s>Sit A ad A-B ut B ad B-C & C ad C-D, &c. </s>
                  <s>& dividendo
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                  fiet A ad B ut B ad C & C ad D, &c.
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                  Q.E.D.
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