Connected algebraic subgroups not lying in a maximal one
Abstract
We prove that for each n ≥ 2, there exists a ruled variety X of dimension n such that Bir(X) contains connected algebraic subgroups which are not lying in a maximal one.
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We prove that for each n ≥ 2, there exists a ruled variety X of dimension n such that Bir(X) contains connected algebraic subgroups which are not lying in a maximal one.