noun
Usage: usually capitalized R
: a non-Euclidian geometry in which straight lines are geodesics and in which the parallel postulate is replaced by the postulate that every pair of straight lines intersects
noun
Usage: usually capitalized R
: a non-Euclidian geometry in which straight lines are geodesics and in which the parallel postulate is replaced by the postulate that every pair of straight lines intersects
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012