Also known as Cauchy root test, Cauchy's radical test
Criterion for the convergence of an infinite series
根值审敛法（Root test）是判别正项级数敛散性的一种方法，又叫做柯西判别法。方法是分析第项的绝对值的次方根的上极限与1的大小关系。
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).