Abstract
It is consistent that there is an order type θ for which\(\psi \not \to [\theta ]_{\aleph _1 }^2\) holds for every type ψ.
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References
P. Erdős, A. Hajnal, A. Máté, R. Rado:Combinatorial Set Theory: Partition Relation for Cardinals, Studies in Logic,106, North-Holland, 1984.
S. Shelah: Can you take Solovay's inaccessible away?Israel Journal of Mathematics,48 (1984), 1–47.
S. Shelah: Consistency of positive partition theorems for graphs and models,Set theory and applications, (J. Steprāns, S. Watson, eds), Springer Lect. Notes1401, 167–193.
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Research partially supported by Hungarian National Science Grant OTKA 016391.
Partially supported by the European Communities (Cooperation in Science and Technology with Central and Eastern European Countries) contract number ERBCIPACT930113.