We prove the global
convergence of an analytical trial free-boundary algorithm, called the operator
method, in the context of a very large class of multiple-free-boundary problems in
ℝN, N ≥ 2. We study the general case of a finite number of annular flow-layers,
having a nested family of closed, (N − 1)-dimensional hypersurfaces as interfaces.
Each interface is characterized by a general non-linear joining condition
relating the normal derivatives of the stream functions in the two adjoining
layers.
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