Assertion: black hole | /r/HasProperty | required for one's purposes
Facets:
value: in the context of interest
type: PURPOSE
Source sentences:
text: What seems to be the most common practice today is, during the course of an investigation, to fix a list of important, characteristic properties of and phenomena associated with black holes required for one's purposes in the context of interest, and then to determine which of the known definitions imply the members of that list.