Notes and calculations on vacuum-polarization.

Calculations.

Calulcations on Peierls' formalism.

Calculations.

Calculations on vacuum-polarization of bosons.

Notes and calculations on vacuum polarization.

Calculations on Vacuum Expectation values of Bilinear Forms in $\Psi,\widehat{\Psi}$ .

Calculations on Heisenberg's Matrix.

Calculations on regular representation of Lorentz goups.