编辑部先后收到云南省昆明市86岁的罗祖根老人的两封来信．谈的都是“关于两数平方差规律的汇报”．第一篇是就“有理数”来谈的,第二篇是就“实数”来谈的．其中的基本的内容如下:“为预防老年痴呆,我重新学习初等数学的代数知识,并取得十分有趣的可喜的成果．我发现:‘每一个数(遵循一定规律)都可以表示为(无数个)两数平方差．’在自得 The Editorial Department has received two letters from the 86-year old Luo Zugen of Kunming City, Yunnan Province. Talk about “report on the law of the two-numbered square difference.” The first one is about “reasonable numbers” and the second one is about “real numbers”. The basic content is as follows: "To prevent Alzheimer’s disease, I re-learned the algebra knowledge of elementary mathematics and obtained very interesting and gratifying results. I discovered: ’Every number (following a certain law) can be expressed as (numerous ) Two-digit squared difference.’