Assertion: curvature's sign | /r/HasProperty | a matter of convention
Facets:
value: probably
type: DEGREE
value: simply
type: MANNER
Source sentences:
text: The negative sign is simply a matter of convention: it is a by-product of the historical development of the subject.
text: which agrees with the formula given in the article apart from a sign (which is probably a matter of convention, at least in dimension 2).