Philosophiæ Naturalis Principia Mathematica was created in
1687.
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Principia Mathematica explained the law of gravity and laws of
motion in mathematical terms.
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Prinicipia Mathematica did not cover the rational basis for
religion.
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The "Principia Mathematica" was written by Alfred North
Whitehead and Bertrand Russell and published in 1910-1913.
Wikipedia has good articles on both.