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math.LO1997
The condition in the Trichotomy Theorem is optimal
Menachem Kojman, Saharon Shelah
We show that the assumption lambda > kappa^+ in the Trichotomy Theorem cannot be relaxed to lambda > kappa .
math.LO1997
Rules and Reals
Martin Goldstern, Menachem Kojman
A ``k-rule" is a sequence A=((A_n,B_n):n<omega) of pairwise disjoint sets B_n, each of cardinality at most k, where A_n is a subset of B_n. A set X of natural numbers (a ``real'')…