Beiträge zur Algebra und Geometrie / Contributions to Algebra and Geometry, Vol. 43, No. 2, pp. 451-477 (2002)

CR Singular Immersions of Complex Projective Spaces

Adam Coffman

Department of Mathematical Sciences, Indiana University Purdue University Fort Wayne, Fort Wayne, IN 46805-1499, e-mail:

Abstract: Quadratically parametrized smooth maps from one complex projective space to another are constructed as projections of the Segre map of the complexification. A classification theorem relates equivalence classes of projections to congruence classes of matrix pencils. Maps from the 2-sphere to the complex projective plane, which generalize stereographic projection, and immersions of the complex projective plane in four and five complex dimensions, are considered in detail. Of particular interest are the CR singular points in the image.

Classification (MSC2000): 14E05, 14P05, 15A22, 32S20, 32V40

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