Assertion: infinitesimal | /r/HasProperty | developed by abraham robinson
Facets:
value: in the 1960s
type: TEMPORAL
Source sentences:
text: The grounds for treating infinitesimal $dx$ as a number is the rigorous theory of infinitesimals first developed by Abraham Robinson in the 1960s, based on earlier work by Thoralf Skolem, Edwin Hewitt, and Jerzy Łoś.