Ex11 15

$\def\abs#1{|#1|}\def\i{\mathbf {i}}\def\ket#1{|{#1}\rangle}\def\bra#1{\langle{#1}|}\def\braket#1#2{\langle{#1}|{#2}\rangle}\def\tr{\mathord{\mbox{tr}}}\mathbf{Exercise\ 11.15}$

Show that the subspaces $V_e$ of Section \ref{stabDiag} are of dimension $2^{n -r}$.

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