1, 2, 3, 4, and their negatives.
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Of course not. The square root of 2 is less than 3, and (pi) is less than 4 .
Try it out! Take the square of several (in this case small) integers, until you find one square that is less than 15, and one that is more.
Yes. All negative integers are also less than 0.
The set of positive odd integers.
This is the 'null' or 'empty' set.There are no numbers greater than '-3' and less than '-9'.