另外，也研究了富足半群的本原元。
In addition, we also consider primitive elements of abundant semigroups.
介绍轮胎有限元分析的基本原理。
介绍了四元数法的基本原理及其在捷联系统中的用法；
The basic theory and the usage of quaternion are also been introduced.
幂等元与本原幂等元在环中有非常重要的地位与作用。
Idempotents and primitive idempotents have very important station in the ring.
幂等元与本原幂等元在环中有非常重要的地位与作用。
Idempotents and primitive idempotents have very important station in the ring.
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