There is a concept in math called the “well ordering property” that states that every nonempty set of integers has a least element. If we were to list, for example, the positive odd integers, we could start with the first odd integer, one, and go on from there. Although seemingly obvious, this concept is used to prove some important theorems. It is an idea that I thought of as I realized that the first of a series of days known as “summer vacation” began this past week.

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