关于江泽坚等著《实变函数论》的一个小瑕疵

摘要

指出江泽坚等合编教材《实变函数论》[2-3]中的一处瑕疵.这个瑕疵起始于第二版,在第三版时又没更正,时间已有22年(1994-2016).鉴于此教材影响大,使用面广,我们特写此注记将此瑕疵指出,与作者和读者商榷.%This paper points out a flaw in "Real Variable Function Theory" (Second edition and Third edition) written by Jiang Ze-jian et al.This flaw started in the second edition, and did not correct in the third edition, which lasted for more than 20 years(1994-2016).In view of the fact that this textbook has great influence and is widely used, we write this note to point out the flaw, and discuss with the author and the reader.