Abstract
Various standard texts on differential topology maintain that the level-preserving map defined by the track of an isotopy of embeddings is itself an embedding. This note describes a simple counterexample to this assertion.
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Geiges, H. Isotopies vis-à-vis level-preserving embeddings. Arch. Math. 110, 197–200 (2018). https://doi.org/10.1007/s00013-017-1109-1
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DOI: https://doi.org/10.1007/s00013-017-1109-1