Session Knot Theory

Cocykle invariants of codimension 2 embeddings of manifolds

Witold Rosicki, University of Gdańsk, Poland
The talk is based on the joint work with Józef H. Przytycki
We consider the classical problem of a position of \(n\)-dimensional manifold \(M^n\) in \(\mathbb{R}^{n+2}\). We show that we can define the fundamental \((n+1)\)-cycle and the shadow fundamental \((n+2)\)-cycle for a fundamental quandle of knotting \(M^n \to \mathbb{R}^{n+2}\). In particular, we show that for any fixed quandle, quandle coloring, and shadow quandle coloring of a diagram of \(M^n\) embedded in \(\mathbb{R}^{n+2}\) we have \((n+1)\)- and \((n+2)\)-(co)cycle invariants (i.e., invariant under Roseman moves). The case \(n=2\) is well-known, and the case \(n=3\) we can explane in a geometric way. The general case we described in arXiv:1310.3030v1.
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