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The set of integers (ℤ) is the set of the positive whole numbers and their additive opposites (the negative whole numbers).
INTEGERS
Apart from zero (which is its own opposite), the opposites of whole numbers are also whole numbers. You have the set of whole numbers which is also known as the set of integers.
Actually the set of integers is the same as the set of whole numbers since the whole numbers include negative whole numbers and zero.
Natural numbers are just whole positive numbers. Since whole positive numbers can represent a distance along a line, they are a subset of real numbers.