Abstract
Let A, B, and C be three n×n matrices. We investigate the problem of verifying whether AB=C over the ring of integers and finding the correct product AB. Given that C is different from AB by at most k entries, we propose an algorithm that uses O(kn2+k2n) operations. Let α be the largest absolute value of an entry in A, B, and C. The integers involved in the computation are of O(n3α2).
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