By extending the quiver state model that calculates the generalized Alexander polynomial defined by Kauffman and Radford, we introduce a new state model via the parity for crossings and define a polynomial called the even generalized Alexander polynomial in the paper. We prove that this polynomial is an invariant of virtual knots and show that there is a specific virtual knot that can be distinguished from the trivial knot by the polynomial. And we introduce other generalized polynomial invariants via parity.
Kim et al. (Thu,) studied this question.
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