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Topology and combinatorics of real line arrangements

E. Artal, J. Carmona, J. I. Cogolludo, M. Marco

math.AGarXiv:math/0307296

Abstract

We prove the existence of complexified real arrangements with the same combinatorics but different embeddings in the complex projective plane. Such pair of arrangements has an additional property: they admit conjugated equations on the ring of polynomials over the number field Q(5).

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