Typing expectation value in LyX

Question

In quantum mechanics it is often needed to write the expectation value of an observable:

How do I type such in LyX?
I can write a bra using leftlangle ___ right| and a ket with left| ___ rightrangle or simply with "Insert delimiters", but I have no idea how to insert a third, middle object between a bra and a ket.

akvilas · Accepted Answer

The right way to do this would be to use

leftlangle psi middle| A middle| psi rightrangle

To get an even more fancy view in LyX, you could wrap this in a math macro (Insert --> Math --> Macro)

Appo · Answer

Include the physics package by typing:
usepackage{physics}

Then you can use bra and ket commands:
$bra{psi}Aket{psi}$

Typing expectation value in LyX

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