Using the concept of derivatives in multivalued directions, differential in
equalities are presented which express in infinitesimal form the defining s
tability properties of the value function of a differential game with hered
itary information [1-7]. As a corollary, stability criteria are obtained fo
r piecewise ci-smooth functionals [7, 8] and for envelopes of a family of c
i-smooth functionals. (C) 2001 Elsevier Science Ltd. All rights reserved.