Infinitesimal holonomy groups of Einstein-Maxwell space-times

Some general results concerning the Petrov classification of the Weyl tensor of space-times whose infinitesimal holonomy group belongs to a given conjugacy class of the Lorentz group ₊ are established using the null tetrad notation. Those conjugacy classes, corresponding to proper subgroups of ₊ which contain the infinitesimal holonomy groups of Einstein-Maxwell space-times, are determined, and explicit examples of such space-times are given for each conjugacy class.