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math.GT2017
Isotopies vis-à-vis level-preserving embeddings
Hansjörg Geiges
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…
math.GT2017
How to depict 5-dimensional manifolds
Hansjörg Geiges
We usually think of 2-dimensional manifolds as surfaces embedded in Euclidean 3-space. Since humans cannot visualise Euclidean spaces of higher dimensions, it appears to be impossi…