00后大学生的智力水平难道不如美国人？

    回答这个问题，我们必须实事求是，言之有据，不能拍脑袋胡说。

J.Keisler在“Elementary Calculus”第一版前言中写道：“I（J.Keisleer） was originally led to write this book when it became clear that Robinson's infinitesimal calculus could be made available to college freshmen. The theory is simply presented; for example, Robinson's work used mathematical logic, but this book does not. I first used an early draft of this book in a one-semester course at the

University of Wisconsin in 1969. In 1971 a two-semester experimental version was

published. It has been used at several colleges and at Nicolet High School near

Milwaukee, and was tested at five schools in a controlled experiment by Sister Kathleen

Sullivan in 1972-1974. The results (in her 1974 Ph.D. thesis at the University of

Wisconsin) show the viability of the infinitesimal approach and will be summarized

in an article in the American Mathematical Monthly（美国数学月刊）.”

Keisler的这段话明显地表明：该微积分教材完全适合上世纪中叶美国大学新生以及高中学生的学习微积分的使用。中国的00后大学生难道不如当时的美国年轻人？非也！

袁萌  7月14日