Abstract
Recently, Zhao et al. (Euro J Oper Res 169:189---201, 2006) discussed a random fuzzy renewal process based on the random fuzzy theory and established Blackwell's theorem in random fuzzy sense. They obtained Blackwell's theorem for fuzzy variables by degenerating the process. However, this result is invalid. We provide some counterexamples and offer a corrected version of fuzzy Blackwell's theorem.
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