A long-standing conjecture states that the crossing number of the Cartesian product of cycles C m \_C n is (m&2) n, for every m, n satisfying n m 3. A crossing is proper if it occurs between edges in different principal cycles. In this paper drawings of C m \_C n with the principal n-cycles pairwise
Drawings of Cm×Cn with One Disjoint Family
✍ Scribed by Gelasio Salazar
- Book ID
- 102583385
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 102 KB
- Volume
- 76
- Category
- Article
- ISSN
- 0095-8956
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✦ Synopsis
We show that every drawing of C m _C n with either the m n-cycles pairwise disjoint or the n m-cycles pairwise disjoint has at least (m&2) n crossings, for every m, n satisfying n m 3. This supports the long standing conjecture by Harary et al. that the crossing number of C m _C n is (m&2) n.
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