Irrational Numbers, Rational Numbers, Integers, Whole numbers, Natural numbers
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Yes.
The subset consisting of the one number, 7.5 : {7.5}
No. Natural numbers are a very small subset of real numbers.
nRURidk
Yes - in fact the set of all even numbers is a subset of the set of all integers, which is, in turn, a subset of the set of all real numbers.