楕だ円えん幾き何か学がく

noun

elliptic geometry; Riemannian geometry

A branch of non-Euclidean geometry where there are no parallel lines and the sum of angles in a triangle exceeds 180 degrees. Often contrasted with hyperbolic geometry.

• 楕だ円えん幾き何か学がくでは、三さん角かく形けいの内ない角かくの和わは180度どより大おおきくなる。

  In elliptic geometry, the sum of the interior angles of a triangle is greater than 180 degrees.

• リーマンは楕だ円えん幾き何か学がくの基き礎そを築きずいた数すう学がく者しゃの一人ひとりである。

  Riemann was one of the mathematicians who laid the foundations of elliptic geometry.