必要十分条件

ひつようじゅうぶんじょうけん

noun

•

necessary and sufficient condition

必	invariably, certain, inevitable
要	need, main point, essence, pivot, key to
十	ten
分	part, minute of time, segment, share, degree, one's lot, duty, understand, know, rate, 1%, chances, shaku/100
条	article, clause, counter for articles, clauses, paragraphs, etc., twig, item, stripe, streak
件	affair, case, matter, item