Abstract

In this paper, an approximation method is given using step type fuzzy number to approximate a general fuzzy number. Say concretely, for any given general fuzzy number, a group of calculation formulas are obtained for the coordinates of the left end point of the left step and the right end point of the right step of the 2-2-step type fuzzy number that is the best approximation of the general fuzzy number, i.e., is nearest to the general fuzzy number. At last, we present specific example to show the effectiveness and usability of our calculation formulas.

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