noun
power series
Mathematical term for an infinite series of the form Σ aₙxⁿ. Compare べき級数, which is a more common synonym.
See also: べき級数
整級数は解析学の基本的な道具の一つだ。
Power series are one of the fundamental tools of analysis.
べき級数 is the more common term for 'power series' in modern Japanese mathematics. 整級数 is a less frequent synonym.
Compound of 整 (sei, 'integer') + 級数 (kyūsū, 'series'). The term likely arose from the fact that the exponents in a power series are non-negative integers.