👉 In mathematics, a birational mapping is a continuous function between two algebraic varieties (or more generally, between an open subset of affine or projective space and itself) that preserves rational equivalence. This means that given any two points in the variety, their images under the map are also in some sense "close" to each other. For example, if we have a plane curve \(C\) with a point \(P\) on it, then the mapping \(\phi: C \to \
