  The electromagnetic field of the ultrarelativistic Reissner-Nordstrom
solution shows the physically highly unsatisfactory property of a vanishing
field tensor but a nonzero, i.e., delta-like, energy density. The aim of this
work is to analyze this situation from a mathematical point of view, using the
framework of Colombeau's theory of nonlinear generalized functions. It is shown
that the physically unsatisfactory situation is mathematically perfectly
defined and that one cannot aviod such situations when dealing with
distributional valued field tensors.
