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1·The paper shows that the method of proving the commutative property of composition for the finite rotations by quaternions is simpler than that by vectors.

文中表明用四元数方法证明该定理比矢量法更为简单。

2·This paper mainly discuss some property of ring which fit into anti-commutative law, and arrive at a conclusion that anti-commutative law is commutable.

本文主要讨论了适合反交换律的环的一些性质，并得出反交换环一定是交换环。