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Distributed computation of homology using harmonics

Abstract

We present a distributed algorithm to compute the first homology of a simplicial complex. Such algorithms are very useful in topological analysis of sensor networks, such as its coverage properties. We employ spanning trees to compute a basis for algebraic 1-cycles, and then use harmonics to efficiently identify the contractible and homologous cycles. The computational complexity of the algorithm is O(Pω)O(|P|^\omega), where P|P| is much smaller than the number of edges, and ω\omega is the complexity order of matrix multiplication. For geometric graphs, we show using simulations that P|P| is very close to the first Betti number.

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