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Definable Ramsey and definable Erdös ordinals |
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| Authors: | Evangelos Kranakis |
| Institution: | 1. Mathematisches Institut der Universit?t, Im Neuenheimer Feld 288/294, D-6900, Heidelberg 1, Germany |
| Abstract: | This paper studies the relation between definable Ramsey ordinals and constructible sets which have a certain set of indiscernibles. It is shown that an ordinal κ is Σ1-Ramsey if and only if κ is ∑ω-Ramsey. Similar results are obtained for definable Erdös ordinals. |
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