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math.RA2011
A closed algebra with a non-Borel clone and an ideal with a Borel clone
Martin Goldstern, Michael Pinsker, Saharon Shelah
Algebras on the natural numbers and their clones of term operations can be classified according to their descriptive complexity. We give an example of a closed algebra which has on…
math.RA2011★ 1 cited
Universality of the lattice of transformation monoids
Michael Pinsker, Saharon Shelah
The set of all transformation monoids on a fixed set of infinite cardinality λ, equipped with the order of inclusion, forms a complete algebraic lattice Mon(λ) with 2^λ compact ele…