双そう射しゃそうしゃMeanings1nounbijectionmathematicsTechnical term in mathematics for a one-to-one and onto mapping between sets.集しゅう合ごうAから集しゅう合ごうBへの双そう射しゃが存そん在ざいするとき、AとBは対たい等とうである。When there exists a bijection from set A to set B, A and B are equivalent.
