Assertion: relativity's theory | /r/HasProperty | based on the proposition
Facets:
Source sentences:
text: The special theory of relativity or special relativity is based on the proposition that the speed of light is a constant no matter how observed, and is independent of the motion of the observer.
text: The general theory of relativity is based on the proposition that there is no physical difference between gravitational force and the force produced by acceleration.