A CLOSED ALGEBRA WITH A NON-BOREL CLONE AND AN IDEAL WITH A BOREL CLONE
نویسندگان
چکیده
منابع مشابه
A Closed Algebra with a Non-Borel Clone and an Ideal with a Borel Clone
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 only unary operations and whose clone of term operations is not Borel. Moreover, we provide an example of a coatom in the clone lattice whose obvious definition via an ideal of subsets of natural numbers would suggest t...
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A Space with Only Borel Subsets
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ژورنال
عنوان ژورنال: International Journal of Algebra and Computation
سال: 2013
ISSN: 0218-1967,1793-6500
DOI: 10.1142/s0218196713500197