f⁡(t)⁢h⁡(x⁢t)=∑j=0n-1∑k=0n-1aj⁢bk⁢tj+α-1-k-β⁢x-k-β+∑j=0n-1aj⁢tj+α-1⁢hn⁡(x⁢t)+∑k=0n-1bk⁢x-k-β⁢t-k-β⁢fn⁡(t)+fn⁡(t)⁢hn⁡(x⁢t).