## DiracBar

An accent representing the Dirac conjugation operation.

Declares an object to be the operator which applies the Dirac bar to a
spinor, i.e. an operator which acts according to
\begin{equation}
\bar{\psi} = i \psi^\dagger \Gamma^0\,.
\end{equation}
For more information see e.g. `sort_spinors`

or `fierz`

.