There are two distinct yet commonplace definitions for natural numbers
- definition 1: all positive integers greater than 0 : { 1, 2, 3...}
- definition 2: all non-negative integers : { 0, 1, 2 ...}
The only difference in these two definitions centers around the number zero. One definition includes zero, and the other one does not.
| Natural Numbers | Not Natural Numbers |
| 1 | -1 |
| 2 | Π |
| 3 | -¼ |
| 1,001 | ¾ |
| 22,005 | -55 |
