弃九法简史初探

A Preliminary Inquiry into the Brief History of the Checking by Casting out Nines

弃九法是一种常见的检验整数间运算结果的方法。对弃九法及其相关衍生算法的产生、演化和传播脉络进行了梳理。10世纪阿拉伯数学家发明了弃九法,13世纪斐波那契将相关算法传入欧洲,17世纪初欧洲传教士将其传入中国。

Casting out nines is a common method to check whether the result of the positive integer operation is correct.This paper combs the evolution and dissemination process of checking by casting out nines and its derivatives.The method of casting out nines was invented by an Arab mathematician in the 10th century,introduced to Europe by Fibonacci in the 13th century,and introduced to China by European missionaries in the early 17th century.