Computing and Combinatorics: 21st International Conference, by Dachuan Xu, Donglei Du, Dingzhu Du

By Dachuan Xu, Donglei Du, Dingzhu Du

This ebook constitutes the refereed court cases of the twenty first foreign convention on Computing and Combinatorics, COCOON 2015, held in Beijing, China, in August 2015. The forty nine revised complete papers and eleven shorter papers awarded have been rigorously reviewed and chosen from numerous submissions. The papers hide a number of issues together with algorithms and knowledge buildings; algorithmic online game thought; approximation algorithms and on-line algorithms; automata, languages, good judgment and computability; complexity concept; computational studying conception; cryptography, reliability and safety; database idea, computational biology and bioinformatics; computational algebra, geometry, quantity idea, graph drawing and data visualization; graph concept, communique networks, optimization and parallel and disbursed computing.

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Additional resources for Computing and Combinatorics: 21st International Conference, COCOON 2015, Beijing, China, August 4-6, 2015, Proceedings

Sample text

It is known [7] that the eigenvalues of P are the union of the eigenvalues of P|C over all strongly connected components C in directed graph G. An important observation is that as long as the strongly connected components and the transition probabilities within a component remain the same, the eigenvalues of P are independent of the transition probabilities between different strongly connected components. This suggests that it might be difficult to use spectral properties to analyze expansion properties involving edges between different strongly connected components.

Then, the weights are chosen such that each vertex u has weight φ(u), and each (directed) edge (u, v) has weight φ(u) · P (u, v), which is the probability mass going from u to v in one step of the random walk starting from distribution φ . Suppose the starting vertex u of a random walk is chosen according to distribution φ . The expansion of a subset S has the following meaning: conditioning on the event that u is in S, it is the probability that the next step of the random walk goes out of S. This notion of expansion can be defined with respect to any distribution on the vertex set V , but the edge weights induced by a stationary distribution has the following Eulerian property: for any subset S of vertices, the sum of weights of edges going out of S is the same as that of edges going into S.

Then dΛ (u) = dΛ (u), + − + hence d(u) = dΛ (u) + dΛ (u) = 2dΛ (u) is even. The following lemma about eulerian graphs will prove useful for the proof of our characterization. Lemma 2. If G is an eulerian graph, then there exists an elementary cycle ( hereafter just called cycle) C of G such that G−E(C) has at most one connected component that is not an isolated vertex. Proof. Being G eulerian and connected, it can be decomposed into edge-disjoint cycles that we can order C1 , · · · , Cn according to the following condition: ∪ik=1 Ci is connected, ∀i ∈ 1, n .

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