What are natural numbers?
Natural numbers are ordinary counting numbers 1,2,3,4,5…. to inifinity.
Conventions
1. A set of positive integers {1, 2, 3, …}
2. A traditional definition; a set of non-negative integers {0, 1, 2, …}
Note: The difference between conventions is simply the zero.
Examples:
{0,1,2,3,4,5…}
{1,2,3,4,5…}