Braket – Dirac bra-ket and set notations

Provides macros to typeset bra-ket notation, as well as set specifiers, with a single ( | ) or a double ( || or ( \| ) vertical bar specifier in between two bracketed parts. Each macro comes in a fixed-size version and an expanding version.

If the package finds itself operating under e-tex, it uses the extended primitive \middle for more reliable results

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