Abstract
The purpose of this paper is to classify torus manifolds (M 2n , T n ) with codimension one extended G-actions (M 2n , G) up to essential isomorphism, where G is a compact, connected Lie group whose maximal torus is T n . For technical reasons, we do not assume torus manifolds are orientable. We prove that there are seven types of such manifolds. As a corollary, if a nonsingular toric variety or a quasitoric manifold has a codimension one extended action then such manifold is a complex projective bundle over a product of complex projective spaces.
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