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From chord parity to chord index. (English) Zbl 1459.57016

Summary: We give a brief survey of virtual knot invariants derived from chord parity or chord index. These invariants have grown into an area in its own right due to rapid developing in the last decade. Several similar invariants of flat virtual knots and free knots are also discussed.

MSC:

57K12 Generalized knots (virtual knots, welded knots, quandles, etc.)
57-02 Research exposition (monographs, survey articles) pertaining to manifolds and cell complexes
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