Assertion: negative claim | /r/HasProperty | proven with omniscience
Facets:
Source sentences:
text: The difference with a positive claim is that it takes only a single example to demonstrate such a positive assertion ("there is a chair in this room," requires pointing to a single chair), while the inability to give examples demonstrates that the speaker has not yet found or noticed examples rather than demonstrates that no examples exist (the negative claim that a species is extinct may be disproved by a single surviving example or proven with omniscience).