where (x1,x1,…,xn) is a vector of non-fuzzy decision variables,ecj is coefficient
in the objective; eai j; ebi are fuzzy coefficients in the constraints;
Cr represents credibility level; i and j represent the index
of the constraint decision variables, respectively. Formula (1a) is
the objective function to be optimized. Formula (1b) shows that
the credibility of constraint (∑
n
j¼1
eai jxj ≤ebi) should be greater than or
equal to level λi. Consider two fuzzy variables (ã and eb) with membership
function μ. The credibility of a fuzzy event, characterized by ea
≤eb, can be defined as follows
where (x1,x1,…,xn) is a vector of non-fuzzy decision variables,ecj is coefficientin the objective; eai j; ebi are fuzzy coefficients in the constraints;Cr represents credibility level; i and j represent the indexof the constraint decision variables, respectively. Formula (1a) isthe objective function to be optimized. Formula (1b) shows thatthe credibility of constraint (∑nj¼1eai jxj ≤ebi) should be greater than orequal to level λi. Consider two fuzzy variables (ã and eb) with membershipfunction μ. The credibility of a fuzzy event, characterized by ea≤eb, can be defined as follows
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