Imaginary Geometry Definition
noun
Absolute geometry , an axiomatised geometry in which the parallel postulate is absent and not replaced by an alternative, and of which Euclidean geometry and some non-Euclidean geometries are subtypes.
Wiktionary
Origin of Imaginary Geometry
of Russian IMAGINARY GEOMETRY IMAGINARY GEOMETRY мнимая геометрия (mnímaja geometrija), coined by mathematician Nicolai Lobachevsky , probably influenced by мнимое число (mnímoje číslo, “imaginary number") , although his precise reasoning is unknown.
From Wiktionary
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