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Baire chains of alternative PI-albegras

✍ Scribed by S. V. Pchelintsev

Publisher
Springer US
Year
1983
Tongue
English
Weight
475 KB
Volume
22
Category
Article
ISSN
0002-5232

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The PI Index of polyomino chains
The PI Index of polyomino chains
✍ Lixing Xu; Shubo Chen πŸ“‚ Article πŸ“… 2008 πŸ› Elsevier Science 🌐 English βš– 213 KB

The PI index is a graph invariant defined as the summation of the sums of n eu (e|G) and n ev (e|G) over all the edges e = uv of a connected graph G, i.e., PI(G) = e∈E(G) [n eu (e|G) + n ev (e|G)], where n eu (e|G) is the number of edges of G lying closer to u than to v and n ev (e|G) is the number