Clearly, the difference operator or sum operator is the convenient tool for the polynomial of factorial powers.

显然，差分算子及其逆算子是阶乘幂多项式的方便工具。

youdao

Clearly, the difference operator or sum operator is the convenient tool for the polynomial of factorial powers.

显然，差分算子及其逆算子是阶乘幂多项式的方便工具。

youdao