Abstract
A representation of the real part of the Heisenberg-Euler Lagrangian density in quantum electrodynamics by means of special functions is obtained. It is shown that this representation is very convenient for numerical calculations of the real part of the Heisenberg-Euler Lagrangian density. It is indicated that this representation is of use for calculations of a quantum electrodynamical field energy density in the absence of real charges and for calculations of polarisation and magnetisation of the vacuum.

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