Assertion: infinitesimal | /r/HasProperty | put on rigorous footing
Facets:
value: during this time
type: TEMPORAL
Source sentences:
text: In non-standard calculus, differentials are regarded as infinitesimals, which can themselves be put on a rigorous footing (see differential (infinitesimal)).
text: It should not be thought that infinitesimals were put on a rigorous footing during this time, however.