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Duality on generalized cuspidal edges preserving singular set images and first fundamental forms

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arxiv 1906.02556 v5 pith:TDFGIPIE submitted 2019-06-06 math.DG

classification math.DG
keywords cuspidaldualityedgessingularboldsymbolfirstformsfundamental
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abstract

In the second, fourth and fifth authors' previous work, a duality on generic real analytic cuspidal edges in the Euclidean 3-space $\boldsymbol R^3$ preserving their singular set images and first fundamental forms, was given. Here, we call this an `isometric duality'. When the singular set image has no symmetries and does not lie in a plane, the dual cuspidal edge is not congruent to the original one. In this paper, we show that this duality extends to generalized cuspidal edges in $\boldsymbol R^3$, including cuspidal cross caps, and $5/2$-cuspidal edges. Moreover, we give several new geometric insights on this duality.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Isometric deformations of mixed type surfaces in Lorentz-Minkowski space

    math.DG 2019-08 conditional novelty 7.0 of 10

    Real analytic generic mixed type surfaces in Lorentz-Minkowski space admit nontrivial local isometric deformations at lightlike points, and the lightlike normal curvature is extrinsic.

  2. Cuspidal edges with the same first fundamental forms along a knot

    math.DG 2019-08 accept novelty 6.0 of 10

    For any admissible real analytic cuspidal edge along a knot, uncountably many non-congruent cuspidal edges share the same first fundamental form.

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