Exercise 3.5 Discussion

$\def\i{\mathbf {i}}\def\ket#1{|{#1}\rangle}\def\bra#1{\langle{#1}|}\def\braket#1#2{\langle{#1}|{#2}\rangle}\mathbf{Exercise\ 3.5}$
Is the state $\frac{1}{\sqrt 2}(\ket 0\ket{+} + \ket{1}\ket{-})$ entangled?

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