Analytic regularity of CR maps into spheres
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Let M N be a connected real-analytic hypersurface and double-struck S2N-1 N the unit real sphere, N > N 2. Assume that M does not contain any complex-analytic hypersurface of N and that there exists at least one strongly pseudoconvex point on M. We show that any CR map f : M double-struck S2N-1 of class CN-N+1 extends holomorphically to a neighborhood of M in N.