 Numbers may be thought to be objects (or abstract objects) of some sort. (Here by numbers we mean natural numbers, that is, \(0\) and the positive integers.) Numbers could be characterized, for example, by the structure they possess as a set. This structure supports properties such as \(0\ne1\), and that the sum of \(n\) and \(m\) is the same number as the sum of \(m\) and \(n\).  Another well-known property of the natural numbers is, for example, the existence of infinitely many prime numbers.