Proof of Lemma 6.3 in ``The crossing number of $K_{4,n}$ on the torus and the Klein bottle"

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We found that Lemma 6.3 in the paper ``The crossing number of $K_{4,n}$ on the torus and the Klein bottle" is wrong.

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Combinatorics, 53C10

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http://salesiana.dossiersoluciones.com/handle/123456789/155889

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0708.3654
 http://arxiv.org/abs/0708.3654

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arXiv