Comment on “Bipolar fuzzy relation equations systems based on the product t‐norm”
YongBin OuYang · Mathematical Methods in the Applied Sciences · 2021
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.