Abstract
An embedding of a multi-graph in a manifold is a closed 2-cell embedding provided the closures of the faces are all closed 2-cells. In this paper we characterized the projective planar multi-graphs that have closed 2-cell embeddings in the projective plane.
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Barnette, D.W. Closed 2-cell embeddings in the projective plane. Israel J. Math. 79, 161–172 (1992). https://doi.org/10.1007/BF02808213
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DOI: https://doi.org/10.1007/BF02808213