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On equational definability of function classes

Couceiro, Miguel; Lehtonen, Erkko; Waldhauser, Tamás

Proceedings of the 41st IEEE International Symposium on Multiple-Valued Logic (ISMVL 2011), IEEE Computer Society, Los Alamitos, (2011), 182-186
http://dx.doi.org/10.1109/ISMVL.2011.19

We propose a notion of functional equation for functions of a fixed arity, which is based on a pair of clones. We present necessary conditions for a class of functions to be definable by such equations, and show that for certain choices of clones these conditions are also sufficient.