Assertion: universe's existence | /r/HasProperty | published in 1680
Facets:
Source sentences:
text: The existence of the constant is implied in Newton's law of universal gravitation as published in the 1680s (although its notation as G dates to the 1890s), but is not calculated in his Philosophiæ Naturalis Principia Mathematica where it postulates the inverse-square law of gravitation.