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Published online by Cambridge University Press: 08 January 2013
We prove that for a generic measure-preserving transformation
$T$, the closed group generated by
$T$ is a continuous homomorphic image of a closed linear subspace of
$L_0(\lambda , {\mathbb R})$, where
$\lambda $ is the Lebesgue measure, and that the closed group generated by
$T$contains an increasing sequence of finite-dimensional tori whose union is dense.