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What is the concept of mathematical closure?
The so-called closure also refers to the scope. In the above example, the first one is the intersection of the set of x and the set of t or A~Z letters, and their closures are the range from the minimum value to the maximum value after addition. The minimum value range is 0, and the maximum value range is zz. The minimum value of the second example is 1, not 2. You should analyze it below, right?