“…4 In particular, local version fractional derivative is well behaved and obeys the Leibniz rule and chain rule, which has been proved not well kept for nonlocal version fractional derivative like Riemann-Liouville and Caputo derivatives. [5][6][7] Meanwhile, it is a natural extension of the usual derivative and can be widely used to establish chain rule, exponential functions, Gronwall's inequality, integration by parts, Taylor power series expansions, Grünwald-Letnikov approach, and calculus of variations for conformable version fractional calculus (see, for example, Abdeljawad 8 ). In addition, Laplace transforms, 8 variation of constants methods, 9 and differential transform method 10 are used to find the representation and stability of solutions to linear conformable differential equations, and functional analysis method is used to deal with nonlinear conformable differential equations 11,12 respectively.…”