Overview: Presents a new concept of Ulam-type stability, i.e., multi-stability.Evaluates maximal stability with minimal error to get a unique optimal solution.Delves into the new study of boundary value problemThe main target of this book is to present a new concept of Ulam-type stability, i.e., multi-stability, through the classical, well-known special functions and to obtain the best approximation error estimates by a different concept of perturbation stability including fuzzy approaches for uncertainty considerations. This stability allows us to obtain diverse approximations depending on va
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