An upper bound for a type of equivalence class sequences was obtained, and for a conjecture about weighted sequences arosed by A.

• 第五章主要处理了有限循环群上的两个零和问题；即最小零和序列的等价类和加权和问题。 作者就一类特殊的等价类序列给出了序列长度的一个上界；另外对于A.