Martin Goldstern

  1. Clones above the unary clone.

    Authors: Saharon Shelah, Martin Goldstern, Gábor Sági
    Subjects: Rings and Algebras
    Abstract

    Let c be the cardinality of the continuum.

    We give a family of pairwise incomparable clones (on a countable base set)
    2^c members, all with the same unary fragment, namely the set of all unary
    operations.

    We also give, for each n, a family of 2^c clones all with the same n-ary
    fragment, and all containing the set of all unary operations.

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