Also known as formal series
generalization of a polynomial, where the number of terms is allowed to be infinite, defined algebraically without consideration of convergence (so that e.g. evaluation is not always defined)
形式幂级数(formal power series)是一个数学中的抽象概念，是从幂级数中抽离出来的代数对象。形式幂级数和从多项式中剥离出来的多项式环类似，不过允许（可数）无穷多项因子相加，但不像幂级数一般要求研究是否收敛和是否有确定的取值。形式幂级数在代数和组合理论中有广泛应用。
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).