Euclid
/ˈjuːklɪd/- (c.300 BC) , Greek mathematician. His great work Elements of Geometry, which covered plane geometry, the theory of numbers, irrationals, and solid geometry, was the standard work until other kinds of geometry were discovered in the 19th century.欧几里得（约公元前300年的古希腊数学家; 其涉及平面几何、数论、无理数和立体几何的伟大著作《几何原本》在19世纪发现其他种类的几何之前一直是公认的经典之作）。