Trapezoidal approximation-preserving the fuzziness of a fuzzy number

Fuzziness is an important index to capture the relevant information about the fuzzy number's ill-defined magnitude. In this paper, we propose a new trapezoidal approximation of an arbitrary fuzzy number, which preserves its fuzziness. Some properties of translation invariance, scale invariance, preservation of expected value, width and fuzziness of this new approximation operator are studied, Furthermore, some numerical examples are provided to show that the new trapezoidal approximation is reasonable.