http://dbpedia.org/data/Crosscap_number.atom 2025-01-09T09:48:28.407752Z http://dbpedia.org/resource/Crosscap_number 2025-01-09T09:48:28.407752Z 4875658 1053422337 Crosscap number In the mathematical field of knot theory, the crosscap number of a knot K is the minimum of taken over all compact, connected, non-orientable surfaces S bounding K; here is the Euler characteristic. The crosscap number of the unknot is zero, as the Euler characteristic of the disk is one. In the mathematical field of knot theory, the crosscap number of a knot K is the minimum of taken over all compact, connected, non-orientable surfaces S bounding K; here is the Euler characteristic. The crosscap number of the unknot is zero, as the Euler characteristic of the disk is one. 1626

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