Yutaro Kabata, Kentaro Saji
Published 2021-01-20Version 1
We give criteria for sharksfin and deltoid singularities from the plane into the plane. We also give geometric meanings for the conditions in the criterion of a sharksfin. As applications, we investigate such singularities appearing on an orthogonal projection of a Whitney umbrella, and a sharksfin appearing on planar motions with 2-degrees of freedom.
The chord index, its definitions, applications and generalizations
On a class of $5$-manifolds with $π_1=\mathbb Z$ with applications to knottings in $S^5$
A survey on knotoids, braidoids and their applications
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