Example of non linear problem

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One example of a non-linear problem is the traveling salesman problem. In this problem, a salesman needs to travel to multiple cities and return to his starting point, while minimizing the total distance traveled. The challenge is to find the optimal route that visits all cities without repeating any, while also considering the different distances between each pair of cities. This problem is non-linear because the distances between cities do not have a linear relationship and cannot be easily solved using linear programming methods.