FUZZY SETS AND FUZZY NUMBERS
Fuzzy set theory, which was introduced by Zadeh (1965)
Although multiplication and division operations on triangular
fuzzy numbers do not necessarily yield a triangular
fuzzy number, triangular fuzzy number approximations
can be used for many practical applications (Kaufmann
and Gupta, 1988). Triangular fuzzy numbers are
appropriate for quantifying the vague information about
most decision problems including Facility location
selection. The primary reason for using triangular fuzzy
numbers can be stated as their intuitive and
computational-efficient representation (Karsak, 2002). A
linguistic variable is defined as a variable whose values
are not numbers, but words or sentences in natural or
artificial language. The concept of a linguistic variable
appears as a useful means for providing approximate
characterization of phenomena that are too complex or ill
defined to be described in conventional quantitative terms
(Zadeh, 1975).