Concordance group of virtual knots

  title={Concordance group of virtual knots},
  author={Hans U. Boden and Matthias Nagel},
  journal={arXiv: Geometric Topology},
We study concordance of virtual knots. Our main result is that a classical knot K is virtually slice if and only if it is classically slice. From this we deduce that the concordance group of classical knots embeds into the concordance group of long virtual knots. 

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