noun
finite series
Mathematical term for a series with a finite number of terms, as opposed to an infinite series.
有限級数の和を求める公式を学んだ。
I learned the formula for finding the sum of a finite series.
無限級数 means 'infinite series', the opposite of 有限級数.
Compound of 有限 (finite) and 級数 (series). The exact historical derivation is uncertain; the term is a standard mathematical calque.