We establish an estimate for the
functional
Cρ is the circumference |t| = ρ,0 ≦ ρ < 1. Here f and g are normalized conformal
mapping functions of |z| < 1 onto a pair of bounded, open, simply connected, origin
containing domains in the w plane whose boundaries are near each other in
some sense. In the second part of the paper we establish an estimate for the
functional I(f′,g′;p) in case the boundaries are additionally assumed to be
rectifiable.
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