|
|||||
|
|
A simple tree lemma and its application to a counterexample of philips |
|
| Authors: | Klaus Potthoff |
| Abstract: | We prove a tree lemma on perfect trees to obtain an ultrafilter of definable subsets of  , which is Ramsey but not conservative (see [Phi 2]). |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |