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Real equivalence of complex matrix pencils and complex projections of real Segre varieties. (English) Zbl 1173.15003
The author constructs quadratically parametrized maps from a product of real projective spaces to a complex projective space as the composition of the Segre embedding with a projection. Further, a classification theorem relates equivalence classes of projections to equivalence classes of complex matrix pencils. One low dimensional case is a family of maps whose images are ruled surfaces in the complex projective plane, some of which exhibit hyperbolic CR singularities. Another case is a set of maps whose images in complex projective $$4$$-space are projections of the real Segre threefold. The paper contains useful descriptions of the real and complex projective spaces.
##### MSC:
 15A22 Matrix pencils 14E05 Rational and birational maps 14J26 Rational and ruled surfaces 14P05 Real algebraic sets 32V40 Real submanifolds in complex manifolds 51N15 Projective analytic geometry
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