- Oct 17, 2011
- 42,380
- 45,515
- Country
- United States
- Faith
- Atheist
- Marital Status
- Legal Union (Other)
How about you describe what infinite means.
Sure, it means "not finite".
a finite set is a set that has a finite number of elements.
{2, 4, 6, 8, 10}
is a finite set with five elements. The number of elements of a finite set is a natural number (a non-negative integer) and is called the cardinality of the set. A set that is not finite is called infinite. For example, the set of all positive integers is infinite:
{1, 2, 3, ...}
----
{1,2,3} is a finite set with 3 elements
{1,2,3,4} is a finite set with 4 elements
{1,2,3,4,5} is a finite set with 5 elements
{1,2,3,4,5,...,N} is a finite set with N elements.
As you correctly observed, "every single positive integer in that set is always followed by another positive integer."
Therefore the set of all positive integers is not finite. If it was finite, the set would end in some largest N. But we know it doesn't end. N+1 is also a positive integer that belongs in the set.
The set of positive integers does not end.
Does not finish
Is not finite
is unfinishable
is infinite
because it does not have a finite number of elements. If you think you've listed them all, you are mistaken, because (as you said) that last one "is always followed by another".
Upvote
0