Two new orthogonal functions named the left- and the right-shifted fractional-order Legendre polynomials (SFLPs) are proposed.\nSeveral useful formulas for the SFLPs are directly generalized from the classic Legendre polynomials. The left and right fractional\ndifferential expressions in Caputo sense of the SFLPs are derived. As an application, it is effective for solving the fractional-order\ndifferential equations with the initial value problem by using the SFLP tau method.
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