Assertion: observation | /r/HasProperty | qualified
Facets:
value: always
type: DEGREE
value: in relativistic physics
type: OTHER
Source sentences:
text: In relativistic physics, an observation must always be qualified by specifying the state of motion of the observer, its reference frame.
text: In relativistic physics, an observation must always be qualified by specifying the state of motion of the observer, its reference frame.