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Upper bound on the order of τ-critical hypergraphs

✍ Scribed by A Gyárfás; J Lehel; Zs Tuza


Publisher
Elsevier Science
Year
1982
Tongue
English
Weight
259 KB
Volume
33
Category
Article
ISSN
0095-8956

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The Order Upper Bound on Parity Embeddin
✍ Thomas Zaslavsky 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 398 KB

A graph 1 is parity embedded in a surface if a closed path in the graph is orientation preserving or reversing according to whether its length is even or odd. The parity demigenus of 1 is the minimum of 2&/(S) (where / is the Euler characteristic) over all surfaces S in which 1 can be parity embedde