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Local Computations on Triangular Graphs

Mazurkiewicz A.

Fundamenta Informaticae

2010

Vol. 100, nr 1/4

117-140

The paper deals with the class of finite triangular graphs. It turns out that this class enjoys regular properties similar to those of trees and complete graphs. The main objective of the paper is to lift algorithms for some typical local computations, known for other classes of graphs, to the class of triangular graphs. Local algorithms on graphs, according to [8, 9], are defined as local rules for relabeling graph nodes. Rules are local, if they are defined only for a class of subgraphs of processed graph (as neighborhoods of nodes or edges) and neither their results nor their applicability do not depend upon the knowledge of the whole graph labeling. While designing local algorithm for triangular graphs one needs to use some intrinsic properties of such graphs; it puts some additional light on their inherent structure. To illustrate essential features of local computations on triangular graphs, local algorithms for three typical issues of local computations are discussed: leader election, spanning tree construction, and nodes ordering. Correctness of these algorithms, as deadlock freeness, proper termination, and impartiality, are proved.The paper deals with the class of finite triangular graphs. It turns out that this class enjoys regular properties similar to those of trees and complete graphs. The main objective of the paper is to lift algorithms for some typical local computations, known for other classes of graphs, to the class of triangular graphs. Local algorithms on graphs, according to [8, 9], are defined as local rules for relabeling graph nodes. Rules are local, if they are defined only for a class of subgraphs of processed graph (as neighborhoods of nodes or edges) and neither their results nor their applicability do not depend upon the knowledge of the whole graph labeling. While designing local algorithm for triangular graphs one needs to use some intrinsic properties of such graphs; it puts some additional light on their inherent structure. To illustrate essential features of local computations on triangular graphs, local algorithms for three typical issues of local computations are discussed: leader election, spanning tree construction, and nodes ordering. Correctness of these algorithms, as deadlock freeness, proper termination, and impartiality, are proved.