
In this note we give an example which shows that the existence of an essential map of an annulus in a nonorientable 3 3 -manifold does not guarantee the existence of an essential embedding in that manifold.
Knots and links in the \(3\)-sphere, Embeddings and immersions in PL-topology
Knots and links in the \(3\)-sphere, Embeddings and immersions in PL-topology
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