第二部分: 数论与关系 (Topic 2: Number Theory and Relations)

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2.1 整除性与最大公约数 (Divisibility and GCDs)

2.2 欧几里得算法 (The Euclidean Algorithm)

2.3 模运算 (Modular Arithmetic)

2.4 线性同余方程 (Solving Linear Modular Congruences)