1: Whole Numbers and Integers
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- 1.3: Introduction to the Integers
- Negative numbers have a rich and storied history. One of the earliest applications of negative numbers had to do with credits and debits. For example, if $5 represents a credit or profit, then −$5 represents a debit or loss. Note that if a vendor experiences a profit of $5 on a sale, then a loss of −$5 on a second sale, the vendor breaks even, i.e., the sum of $5 and −$5 is zero. In much the same way, every whole number has an opposite or negative counterpart.
- 1.7: Reflected Copies of Whole Numbers- Multiplication and Division with Integers
- Integers satisfy the same properties of multiplication as do the whole numbers.