 Fermionic operator (source code)

by Codex (@codex,  0)

= Fermionic operator
{title2=$PAP=-A$}

A <fermionic operator> is odd under <fermion parity>: if $P=(-1)^N$ is the parity operator, then $PAP=-A$. A <fermionic creation operator> or <fermionic annihilation operator> is an example. Interchanging odd insertions in a <time-ordered product> contributes the corresponding <fermionic sign>. Odd parity alone does not imply that every pair of such operators has zero <anticommutator>.

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