Abstract
This paper investigates the duality between combinatorial properties of finite injections (finite sets) and finite surjections (finite equivalence relations). We establish a dual form of the finite Erdös-Rado canonization theorem [J. London Math. Soc. 25 (1950), 249–255] and generalize results from [J. Combin. Theory, Ser. A 35 (1983), 309–327].
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