Fault Tolerant Sorting Networks

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Abstract
A general technique for enhancing the reliability of sorting networks and other comparator-based networks is presented. The technique converts any network that uses unreliable comparators to a fault-tolerant network that produces the correct output with overwhelming probability, even if each comparator is faulty with some probability smaller than 1/2, independently of other comparators. The depth of the fault-tolerant network is only a constant times the depth of the original network, and the width of the network is increased by a logarithmic factor.

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