论文信息 - The set of maximal closed classes of operations on an infinite setA has cardinality $$2^{2^{^{\left| A \right|} } }$$ - 字舞流文

The set of maximal closed classes of operations on an infinite setA has cardinality $$2^{2^{^{\left| A \right|} } }$$

I. G. Rosenberg

[1] Some maximal closed classes of operations on infinite sets , 1974 .

[2] Emil L. Post. The two-valued iterative systems of mathematical logic , 1942 .

[3] Ivo G. Rosenberg. The Number of Maximal Closed Classes in the Set of Functions over a Finite Domain , 1973, J. Comb. Theory, Ser. A.