Benlaiter, Chrifa2021-07-182021-07-182021http://dspace.univ-msila.dz:8080//xmlui/handle/123456789/25074In this memoir, we have studied the concept of fuzzy number. We also discussed arithmetic operations on fuzzy numbers, and its use in calculating nite integrals of fuzzy functions in the cases of fuzzy terms and crisp terms, and crisp functions at the fuzzy interval, and as well in computation fuzzy differential.enFuzzy sets, fuzzy numbers, fuzzy functions, fuzzy functions integration, fuzzy functions di erentiation.On the fuzzy numbersThesis