most citedOn embedding certain partial orders into the P-points under RK and Tukey reducibility

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math.LO2014★ 1 cited

On embedding certain partial orders into the P-points under RK and Tukey reducibility

Dilip Raghavan, Saharon Shelah

The study of the global structure of ultrafilters on the natural numbers with respect to the quasi-orders of Rudin-Keisler and Rudin-Blass reducibility was initiated in the 1970s b…