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.

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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.

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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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