
In this paper we propose a new way of looking at cographs and show how it affords us a fast parallel recognition algorithm. Additionally, should the graph under investigation be a cograph, our algorithm constructs its unique tree representation. Next, given a cograph along with its tree representation we obtain a fast parallel coloring algorithm. Specifically, for a graph G with n vertices and m edges as input, our parallel recognition algorithm runs in O(logn) EREW time using \(O(\frac{{n^2 + mn}}{{\log n}})\) processors. Once the cotree of a cograph is available, our coloring algorithm runs in O(log n) EREW time using \(O(\frac{n}{{\log n}})\) processors.
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