Abstract
This note provides counterexamples to illustrate that Theorem 4 which is proposed by Cornejo, Lobo, and Medina (Bipolar fuzzy relation equations systems based on the product t‐norm. Mathematical Methods in the Applied Sciences. 2019,42(17):5779‐5793) is incorrect. The incorrect of Theorem 4 is due to the inaccuracy of the definition of feasible pair. Then, we present the correction of the definition of feasible pair to the contention.
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