Abstract
A direct derivation is given of the functional-integral representation for the Green's functions of quantum theories built from a finite number of canonical fermion operators ${Q}_{\ensuremath{\alpha}}$, ${Q}_{\ensuremath{\alpha}}^{\ifmmode\dagger\else\textdagger\fi{}}$ with ${{Q}_{\ensuremath{\alpha}}, {Q}_{\ensuremath{\beta}}^{\ifmmode\dagger\else\textdagger\fi{}}}={\ensuremath{\delta}}_{\ensuremath{\alpha}\ensuremath{\beta}}$.
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