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    On a Fractional Operator Combining Proportional and Classical Differintegrals
    (Mdpi, 2020) Baleanu, Dumitru; Fernandez, Arran; Akgul, Ali
    The Caputo fractional derivative has been one of the most useful operators for modelling non-local behaviours by fractional differential equations. It is defined, for a differentiable function f(t), by a fractional integral operator applied to the derivative f ' (t). We define a new fractional operator by substituting for this f ' (t) a more general proportional derivative. This new operator can also be written as a Riemann-Liouville integral of a proportional derivative, or in some important special cases as a linear combination of a Riemann-Liouville integral and a Caputo derivative. We then conduct some analysis of the new definition: constructing its inverse operator and Laplace transform, solving some fractional differential equations using it, and linking it with a recently described bivariate Mittag-Leffler function.