Back هندسة ثنائية الإنطاق Arabic Birationale Äquivalenz German Géométrie birationnelle French Geometria birazionale Italian 双有理幾何学 Japanese Birationale meetkunde Dutch Geometria birracional Portuguese Бирациональная геометрия Russian Birationell geometri Swedish Біраціональна геометрія Ukrainian
In mathematics, birational geometry is a field of algebraic geometry in which the goal is to determine when two algebraic varieties are isomorphic outside lower-dimensional subsets. This amounts to studying mappings that are given by rational functions rather than polynomials; the map may fail to be defined where the rational functions have poles.