Matematik Bölümü, Orta Do\u gu Teknik Üniversitesi 06531 Ankara, TURKEY e-mail: serdem@rorqual.cc.metu.edu.tr
Abstract: Some relations are established between harmonic maps $f$ of Lorentz surfaces $M$ into indefinite Riemannian manifolds and paracomplex analysis including a theory of quadratic and higher order differentials associated to $f$ as in the Riemannian case.
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