通过合理地选择坐标轴，使对称连杆曲线的离散数据满足共轭对称性。
By properly setting the coordinate axis, the discrete data of a symmetric coupler curve are made to satisfy the conjugate symmetry.
判断矩阵是否是自反的，对称的，离散数学中的二元关系。
Matrix to determine whether it is reflexive and symmetric, Discrete Mathematics in the binary relation.
提出了一种基于复合离散混沌系统的对称图像加密算法。
In this paper, a symmetric image encryption scheme based on composite discrete chaotic system is presented.
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