For a strongly convex Φ(t),
denote by HΦ the class of Φ-bounded harmonic functions, and by CΦ the class of
continuous functions f on the Wiener harmonic boundary such that the composite
Φ(|f|) is integrable with respect to a harmonic measure. Theorem: u ∈ HΦ if and
only if u is a solution of the Dirichlet problem with boundary values f ∈ CΦ on the
Wiener harmonic boundary.