combinatorial mathematics

例句：

1. 1.The theorem states that the sum of two numbers is equal to their product divided by their greatest common divisor.
   定理表明两个数之和等于它们的最大公约数除以它们的乘积。
2. 2. In combinatorial mathematics, we study the properties and algorithms for solving problems involving combinationsof objects.
   在组合数学中，我们研究涉及对象组合的问题的性质和算法。
3. 3.The combinatorial problem of finding the shortest path in a graph is known as the traveling salesman problem.
   寻找图中最短路径的组合问题被称为旅行商问题。