双そう曲きょく幾き何か学がく

noun

hyperbolic geometry

A branch of non-Euclidean geometry dealing with spaces of constant negative curvature. Technical term used in mathematics.

• 双そう曲きょく幾き何か学がくでは、平へい行こう線せんが無む数すうに存そん在ざいする。

  In hyperbolic geometry, there are infinitely many parallel lines.