Assertion: polar coordinate | /r/CreatedBy | gregorio fontana
Facets:
value: in the 18th-century
type: TEMPORAL
Source sentences:
text: Grégoire de Saint-Vincent and Bonaventura Cavalieri independently introduced the concepts in the mid-seventeenth century, though the actual term polar coordinates has been attributed to Gregorio Fontana in the 18th-century.
text: The actual term polar coordinates has been attributed to Gregorio Fontana and was used by 18th-century Italian writers.