本文的目的是证明关于结合环可换性的三个定理。
The object of this paper is to prove three theorems of associated ring's commutativity.
装配式成形铣刀由于其可调性和可换性等优点，在加工复杂曲面中得到广泛应用。
The assembly type formed milling cutter is widely applied in manufacturing complicated curve surface because of its advantages of adjustability and changeability.
本文给出了BCH—代数与非负BCH—代数的并代数的概念，并且讨论了拟可换性。
This paper introduced the concept of a union algebra of BCH-algeba and non-negetive BCH-algebra, and discussed quasi-commutativity of (HP) Union algebra.
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