双有理几何 Birational geometry
（重定向自Birational morphism）
在代数几何中，双有理几何处理的是代数簇在双有理等价之下不变的性质，也就是由其函数域决定的性质。这些性质包括维度、算术亏格、几何亏格、小平维度等等。
Birational morphism
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Birational geometry 双有理几何
（重定向自Birational morphism）
In mathematics, birational geometry is a field of algebraic geometry the goal of which 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.
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