His notation is different from modern notation but can be constructed using more modern summation notation.

他的符号是不同的，从现代符号，但可以采用更现代的求和符号。

youdao

His notation is different from modern notation but can be constructed using more modern summation notation.

他的符号是不同的，从现代符号，但可以采用更现代的求和符号。

youdao