| |
| | More on Cardinal Numbers |
 | | Naming this cardinal number \aleph_0, aleph-null, Cantor proved that many subsets of N have the same cardinality as N, even if this might be against intuition at first. |
 | | Cantor also developed a lot of the general theory of cardinal numbers; he proved that there is a transfinite cardinal number that is the smallest (\aleph_0, aleph-null) and that for every cardinal number, there is a next-larger cardinal (\aleph_1, \aleph_2, \aleph_3, \cdots). |
 | | It can also be proved that the cardinal \aleph_0 (aleph-0, where aleph is the first letter in the Hebrew alphabet, represented א) of the set of natural numbers is the smallest infinite cardinal, i.e., that any infinite set admits a subset of cardinality \aleph_0. |
| www.artilifes.com /cardinal-numbers.htm (2039 words) |
|