  The interactions of the neutrini and antineutrini amongst themselves, as well
as the interactions of these particles with the electrons and the positrons,
are of interest in simulations of the early Universe and in studies of the
processes involving compact stars. The objective in this paper is to create a
reliable source of information regarding the differential and total cross
sections of these interactions; expressions for these observables will be
obtained using standard methodology. A number of relevant discrepancies in the
literature will be addressed.
