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Finite Type Invariants and Virtual TwistMoves of Virtual Knots

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Abstract

Generalizing twist moves of classical knots, we introduce t(a1;    ; am)-moves of virtual knots for an m{tuple (a1;    ; am) of nonzero integers. In [4], M. Goussarov, M. Polyak and O. Viro introduced finite type invariants of virtual knots and Gauss diagram formulae giving combinatorial presentations of nite type invariants. By using the Gauss diagram formulae for the nite type invariants of degree 2, we give a necessary condition for a virtual long knot K to be transformed to a virtual long knot K0 by a nite sequence of t(a1;    ; am)-moves for an m-tuple (a1;    ; am) of nonzero integers with the same sign.

참고문헌 (13)

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