We introduce a family of AC-compatible Knuth-Bendix simplification orders which are AC-total on ground terms. Our orders preserve attractive features of the original Knuth-Bendix orders such as existence of a polynomial-time algorithm for comparing terms; computationally efficient approximations, for instance comparing weights of terms; and preference of light terms over heavy ones. This makes these orders especially suited for automated deduction where efficient algorithms on orders are desirable.
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