They are the same set.
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A set of integers contains all the whole numbers both positive and negative, including zero, from -∞ to +∞.
The set of negative integers.
A mixed number consists of a whole number and a fraction, and it cannot be represented as a single integer or whole number. In the set of integers, only whole numbers and their negative counterparts are included. Similarly, in the set of whole numbers, only positive integers and zero are included. Mixed numbers do not fit into either of these categories.
This is the definition of the set of 'Integers'.
The smallest single digit whole number, i.e. integer, is -9. The phrase whole number should not be confused with the natural numbers, integers that go from 1 to +infinity. A whole number is any number that is in the set of integers, that is, the group of integers ranging from -infinity to +infinity.