Comment on “Bipolar fuzzy relation equations systems based on the
product t-norm”
Abstract
This note provides counterexamples to illustrate that Theorem 4 which is
proposed by Cornejo, Lobo and Medina [M. E. Cornejo, D. Lobo, J.
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.