Abstract

Let μμ be a strong limit singular cardinal. We prove that if 2μ>μ+2^μ > μ^+ then (μ+μ)→(τμ)<cf(μ)\binom{μ^+}μ\to \binomτμ_{<{\rm cf}(μ)} for every ordinal τ<μ+τ<μ^+. We obtain an optimal positive relation under 2μ=μ+2^μ= μ^+, as after collapsing 2μ2^μ to μ+μ^+ this positive relation is preserved.

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