tμ-1∗f=∑s=0n-1as⁢Γ⁡(μ)⁢Γ⁡(1-s-α)Γ⁡(μ+1-s-α)⁢tμ-s-α-∑s=1ncs⁢Γ⁡(μ)Γ⁡(μ-s+1)⁢tμ-s+tμ-1∗fn