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Communicated by Karl H. Hofmann
This author gratefully acknowledges support received from the National Science foundation via Grants DMS-8320383 and DMS-8520873.
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Davenport, D., Hindman, N. Subprincipal closed ideals in βN. Semigroup Forum 36, 223–245 (1987). https://doi.org/10.1007/BF02575018
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DOI: https://doi.org/10.1007/BF02575018