Fractal dimensions of fractional integral of continuous functions

In this paper, we mainly explore fractal dimensions of fractional calculus of continuous functions defined on closed intervals. Riemann.Liouville integral of a continuous function f(x) of order v(v > 0) which is written as D .v f(x) has been proved to still be continuous and bounded. Furthermore, upper box dimension of D .vf(x) is no more than 2 and lower box dimension of D .v f(x) is no less than 1. If f(x) is a Lipshciz function, D .v f(x) also is a Lipshciz function. While f(x) is differentiable on [0, 1], D .v f(x) is differentiable on [0, 1] too. With definition of upper box dimension and further calculation, we get upper bound of upper box dimension of Riemann.Liouville fractional integral of any continuous functions including fractal functions. If a continuous function f(x) satisfying Hölder condition, upper box dimension of Riemann.Liouville fractional integral of f(x) seems no more than upper box dimension of f(x). Appeal to auxiliary functions, we have proved an important conclusion that upper box dimension of Riemann.Liouville integral of a continuous function satisfying Hölder condition of order v(v > 0) is strictly less than 2 . v. Riemann.Liouville fractional derivative of certain continuous functions have been discussed elementary. Fractional dimensions of Weyl.Marchaud fractional derivative of certain continuous functions have been estimated.