A concept of kernel matrix of quaternion is proposed, which is based on rotation group algebra and with spacecraft attitude control as its background.
基于旋转群代数，以航天器姿态控制研究为背景，提出了四元数的核心矩阵的概念。
In the blank control group, no rotation was observed, and there was no abnormality of pathological observation.
空白对照组无旋转现象，病理学观察无异常现象。
In this thesis, the axis rotation symmetry of third-order nonlinear elasticity was researched with the help of group theoretical methods.
本文用群论的方法研究了三阶非线性弹性的轴转动对称性。
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