We prove that every bipartite C 2' -free graph G contains a C 4free subgraph H with e(H) ! e(G)=(' À 1). The factor 1=(' À 1) is best possible. This implies that ex(n; C 2' ) 2(' À 1)ex(n; fC 4 ; C 2' g), which settles a special case of a conjecture of Erdo ˝s and Simonovits.
Even cycles in graphs
✍ Scribed by Joseph G. Conlon
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 888 KB
- Volume
- 45
- Category
- Article
- ISSN
- 0364-9024
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
Let G be a 3‐connected simple graph of minimum degree 4 on at least six vertices. The author proves the existence of an even cycle C in G such that G‐V(C) is connected and G‐E(C) is 2‐connected. The result is related to previous results of Jackson, and Thomassen and Toft. Thomassen and Toft proved that G contains an induced cycle C such that both G‐V(C) and G‐E(C) is 2‐connected. G does not in general contain an even cycle such that G‐V(C) is 2‐connected. © 2004 Wiley Periodicals, Inc. J Graph Theory 45: 163–223, 2004
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