Since the term “Fuzzy differential equations”(FDEs) emerged in the literature in 1978,
prevailing research effort has been dedicated not only to the development of the concepts …

We introduce the interval double integral for interval-valued functions, and give some
fundamental properties. Further, we establish some continuous and discrete Chebyshev …

In this article, the notions of gH-directional derivative, gH-Gâteaux derivative and gH-Fréchet
derivative for interval-valued functions are proposed. The existence of gH-Fréchet derivative …

An analytical investigation of a DC motor with interval uncertainties is performed in this study
and a new approach by interval analysis is suggested for optimal control of the system. The …

Many mathematical models describe the Corona virus disease 2019 (COVID-19) outbreak;
however, they require advance mathematical skills. The need for this study is to determine …

This paper is devoted to derive optimality conditions and duality theorems for interval-valued
optimization problems based on gH-symmetrically derivative. Further, the concepts of …

In this paper, the fuzzy fundamental triangular solution of the fractional diffusion equation
under Caputo generalized Hukuhara partial differentiability by using the fuzzy Laplace …

This article proposes a general gH-gradient efficient-direction method and a W W-gH-
gradient efficient method for the optimization problems with interval-valued functions. The …

The main purpose of this paper is to obtain an analytical solution for the time-fractional fuzzy
equation. To do this, the time-fractional equation is transformed into an algebraic equation …

In this paper, we obtain a version of Ekeland's variational principle for interval-valued
functions by means of the Dancs-Hegedüs-Medvegyev theorem (Dancs et al.(1983)[14]). We …