In some books of quantum mechanics, the would like to write the product state as, for instance,(adsbygoogle = window.adsbygoogle || []).push({});

[tex]|\alpha\rangle_1|\beta\rangle_2[/tex]

where 1 and 2 denotes different particle. If I want to write the corresponding bra vector, does the order matter? Which form is correct?

[tex]{}_1\langle\alpha|{}_2\langle\beta|[/tex]

or

[tex]{}_2\langle\beta|{}_1\langle\alpha|[/tex]

???

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# Bra of product state

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