A whole number is called an integer. The opposite of a whole number is a negative integer. An example would be 4 and -4.
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Integer
That is called the set of "integers".
The two sets are the same: the set of integers.
The set of integers I. I = {..., -3, -2, -1, 0, 1, 2, 3, ...}
Yes, parallel and perpendicular are opposites.