In math class, we learned about geometric series.

数学课上我们学习了几何级数。

In this paper, we discuss how to use the geometric series to find the sums of power series and to represent functions by power series.

就此讨论一类等比级数在求幂级数的和函数以及将函数展开成幂级数时的应用。

Rather, they represent the mathematical relationship between the pitch frequencies of different notes which form a geometric series.

相反，它们其实代表了不同音符的频率之间的数学关系，这些频率构成一个等比数列。