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If $V$,$W$are two inner product spaces and $L:V\to W$ is a linear map with its adjoint $L^\star$, then is there a decomposition of $W$=ker$(L^\star)$ $ \oplus $ im$(L)$ ? (It is easy that the conclusion holds if $V$ and $W$ are finite-dimensional)

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    I think, $L^*$ is not well definied, so you should give your definition.2012-04-06

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