Mathematics, 25.08.2021 05:00, Teeboz

Closure illustrates that a characteristic of a set is not necessarily a characteristic of all of its subsets. The real
numbers are closed with respect to multiplication, but the irrational numbers, a subset of the real numbers, are not. Give an example of a set that is not mathematical that has a particular characteristic, but which has a subset without this characteristic.

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Closure illustrates that a characteristic of a set is not necessarily a characteristic of all of i...