Assertion: euclidean geometry | /r/HasProperty | explored by nikolai ivanovich lobachevsky
Facets:
value: in the 19th century
type: TEMPORAL
value: extensively
type: DEGREE
Source sentences:
text: In the 19th century, hyperbolic geometry was explored extensively by Nikolai Ivanovich Lobachevsky, János Bolyai, Carl Friedrich Gauss and Franz Taurinus.
text: In the nineteenth century, hyperbolic geometry was explored by János Bolyai and Nikolai Ivanovich Lobachevsky, after whom it sometimes is named.