Assertion: complex number | /r/HasProperty | introduced by mathematician
Facets:
value: in the 18th century
type: TEMPORAL
value: to make sense of this equation
type: PURPOSE
Source sentences:
text: Imaginary numbers, and their extension, the complex numbers, were introduced by mathematicians in the 18th century to make sense of this equation, and were originally thought to be highly abstract mathematical objects of no possible use.