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Generically Dependent Continuant
RDF description of The crossing number of a projective graph is quadratic in the face - Width - http://orbis.uaslp.mx/vivo/individual/scopus35
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We show that for each integer g ≥ 0 there is a constant cg > 0 such that every graph that embeds in the projective plane with sufficiently large face-width r has crossing number at least cgr 2 in the orientable surface Σ3 of genus g. As a corollary, we give a polynomial time constant factor approximation algorithm for the crossing number of projective graphs with bounded degree.
The crossing number of a projective graph is quadratic in the face - Width