# Monthly Archives: February 2012

## MA and its effect on Tree Partitions

(This is the presentation I gave for Stevo Todorcevic’s course Combinatorial Set Theory on Feb 28, 2012. The material comes from Stevo’s 1983 paper “Partition Relations for Partially Ordered Sets”.) In partition relations for ordinals, it has been established that: Theorem (Erdos-Rado). $\omega_1 \rightarrow (\omega_1, \omega+1)^2$ Later it was shown that this is the best […]