Question on self adjoint properties

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I have the follwing question and have managed to do it all apart from the last 3 parts of c) showing the various statements. Cant figure out where to start! Any help will be appreciated!

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Note that if $v$ is an eigenvector of $S^{-1}PS^{-1}$ with eigenvalue $\lambda$, then $$PS^{-1}v = \lambda Sv$$ Now let $e = S^{-1}v$.