| Authors: | Todorčević, Stevo |
| Title: | Directed sets and cofinal types |
| Journal: | Transactions of the American Mathematical Society |
| Volume: | 290 |
| Issue: | 2 |
| First page: | 711 |
| Last page: | 723 |
| Issue Date: | 1-Jan-1985 |
| Rank: | M21 |
| ISSN: | 0002-9947 |
| DOI: | 10.1090/S0002-9947-1985-0792822-9 |
| Abstract: | We show that 1, ω, ω1 × ω1 and [ω11ω are the only cofinal types of directed sets of size N1, but that there exist many cofinal types of directed sets of size continuum. |
| Publisher: | American Mathematical Society |
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