本文介绍了一个循环差集的存在性定理。
A new existence theorem on cyclic difference sets is introduced in this note.
本文提出两条等价性定理，用来判别不同排列的相位循环是否等价。
Two equivalent theorems are presented which judge whether phase cycles of different arrangements are equivalent.
根据卡诺定理给出了热机的循环效率极大值问题。
Carnot's Theorem discusses the extreme value of the efficiency of heat engines' cycles.
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