It belongs to an infinite number of sets.
For example the sets of:
- rational numbers
- positive numbers
- numbers between 4 and 5
- numbers between 4 and 6
- numbers between 3 and 7
- numbers ending in ".8"
- numbers appearing in questions on WikiAnswers
- numbers contained in your homework problems
- numbers less than 100
- the numbers {1.3, 4.8, 13.7}
and so on.
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