We consider the indeterminacy in the sign of the neutrino asymmetry generated
by active-sterile neutrino oscillations in the early universe. The dynamics of
asymmetry growth is discussed in detail and the indeterminacy in the final sign
of the asymmetry is shown to be a real physical phenomenon. Recently published
contradicting results are carefully considered and the underlying assumptions
leading to the disagreement are resolved.Comment: 12 pages, Latex, 4 eps figures, uses cite.st
