Heath-Brown具体构造出无穷多组4项算术级数,其中每项均能表示为两个正整数的平方和.本文回答了陈永高教授提出的一个更一般的问题.
They also remarked that Heath-Brown gave explicitly infinitely many 4-term arithmetic progressions, where each term can be written as sums of two squares. This paper answers a question posed by Professor Y. G. Chen.