• 1. permutation group theory: 置换群理论
• 2. permutation group theory method: 置换群理论
• 3. graph theory and permutation group: 图论与置换群

• 1.In the nineteenth century, the system of algebraic knowledge is enormous, which contains the permutation group, matrix, algebraic number theory, algebraic geometry and other branches.
  十九世纪的代数学知识体系庞大，它包含置换群、矩阵、代数数论、代数几何等多个分支。
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