(n) (mathematics) geometry based on axioms different from Euclid's, Example:non-Euclidean geometries discard or replace one or more of the Euclidean axioms
[罗巴切夫斯基 / 羅巴切夫斯基, Luó bā qiè fū sī jīㄌㄨㄛˊ ㄅㄚ ㄑㄧㄝˋ ㄈㄨ ㄙ ㄐㄧ] Nikolai Ivanovich Lobachevsky (1793-1856), one of the discoverers of non-Euclidean geometry#355308