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Extending a Morse function to a non-orientable $3-$manifold. (arXiv:1709.03328v1 [math.GT])

Considering a solid 3-dimensional Klein bottle and a collaring of its boundary, can we extend a generic $C^\infty$ non-singular function defined on the collaring to the full solid Klein bottle without critical points? We give a condition on the Reeb graph of the given function that is necessary and sufficient for the existence of such a non-singular extension.查看全文

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