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Weihrauch reducibility between Ramsey-type theorems and w...
Lorenzo Carlucci, Giordano Celli · 2025-11-26 · via math.CO updates on arXiv.org

We study the relations under Weihrauch reducibility of the well-ordering preservation principle for the operator $X \mapsto X^ω$ and the Ordered Ramsey Theorem. Both principles are known to be equivalent to $Σ^0_2$-induction in Reverse Mathematics. We show that the Ordered Ramsey Theorem is Weihrauch-equivalent to the parallel product of the well-ordering preservation principle for the operator $X \mapsto X^ω$ and the Eventually Constant Tail principle. By previous work from Pauly, Pradic and Soldà, the Ordered Ramsey Theorem is known to be Weihrauch-equivalent to the parallel product of the Eventually Constant Tail principle and the parallelization of the jump of the Limited Principle of Omniscience. We show that the latter pinciple and the well-ordering preservation principle for $X \mapsto X^ω$ are Weihrauch-incomparable.