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Rail knotoids

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arxiv 1812.09493 v3 pith:NZ6TOOAP submitted 2018-12-22 math.GT

classification math.GT
keywords railmathbbarcsisotopyknotoidnotionscallconnection
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abstract

We work on the notions of rail arcs and rail isotopy in $\mathbb{R}^3$, and we introduce the notions of rail knotoid diagrams and their equivalence. Our main result is that two rail arcs in $\mathbb{R}^3$ are rail isotopic if and only if their knotoid diagram projections onto the plane of the two lines which we call rails, are equivalent. We also make a connection between the rail isotopy in $\mathbb{R}^3$ and the knot theory of the handlebody of genus $2$.

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  1. Braidoids

    math.GT 2019-08 conditional novelty 6.0 of 10

    Braidoids are defined and shown to satisfy analogues of the Alexander and Markov theorems, so planar knotoids can be braided and braidoid equivalence corresponds to knotoid isotopy.

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