A simple method of solving an orthogonal transformation with a primary transformation is presented by change quadric form into canonical form. 给出了利用初等变换求一个正交变换化实二次型为标准形的简便方法。
Through an orthogonal transformation of coordinates systems, the eigen-equations of the LWL optical vibrations in single-walled BN nanotubes are obtained. 并通过坐标系的正交变换，得到了单壁硼氮纳米管中长波光学振动的本征方程。
