105.
For the class II(ℝ
m
) of continuous almost periodic functions
f: ℝ
m
→ ℝ, we consider the problem of the existence of the limit
where the least upper bound is taken over all solutions (in the sense of Carathéodory) of the generalized differential equation
{ie365-1} ε
G, γ(0)=
a
0. We establish that if the compact set
G ⊂ ℝ
m
is not contained in a subspace of ℝ
m
of dimension
m−1 (i.e., if it is nondegenerate), then the limit exists uniformly in the initial vector
a
0 ε ℝ
m
. Conversely, if for any function
f ε π(ℝ
m
), the limit exists uniformly in the initial vector
a
0 ε ℝ
m
, then the compact set
G is nondegenerate. We also prove that there exists an extremal solution for which a limit of the maximal mean uniform in the
initial conditions is realized.
Translated from
Matematicheskie Zametki, Vol. 67, No. 3, pp. 433–440, March, 2000.
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