a generalized model for fuzzy linear programs with trapezoidal fuzzy numbers

‎ in this paper, we generalize a linear programming problem with symmetric trapezoidal ‎fuzzy number which is introduced by ganesan and et al. in to a general kind of trapezoidal fuzzy number. in this way, we first establish a new ‏arithmetic operation for multiplication of two ‏trapezoidal fuzzy numbers. then in order to ‎preparing a method for solving the fuzzy linear programming as well as the primal simplex ‎algorithm, we use a general linear ranking function as a convenient approach in the literature. in fact, our main contribution in this work is based on 3 items: 1) extending the current fuzzy linear program to a general kind which is not essentially including the symmetric trapezoidal fuzzy number‎s ‎‏,‏ 2) defining a new multiplication role of two trapezoidal fuzzy number‎s‎, 3) establishing a fuzzy primal simplex algorithm for solving the generalized model. we in particular emphasize that this study can be used for establishing fuzzy dual simplex algorithm, fuzzy primaldual simplex algorithm, fuzzy multi objective linear programming and the other similar methods which are appeared in the literature.