@article{DeneckeSaengsura2009,
  author    = {Denecke, Klaus-Dieter and Saengsura, Kittisak},
  title     = {Separation of clones of cooperations by cohyperidentities},
  issn      = {0012-365X},
  doi       = {10.1016/j.disc.2008.01.043},
  year      = {2009},
  abstract  = {An n-ary cooperation is a mapping from a nonempty set A to the nth copower of A. A clone of cooperations is a set of cooperations which is closed under superposition and contains all injections. Coalgebras are pairs consisting of a set and a set of cooperations defined on this set. We define terms for coalgebras, coidentities and cohyperidentities. These concepts will be applied to give a new solution of the completeness problem for clones of cooperations defined on a two-element set and to separate clones of cooperations by coidentities.},
  language  = {en}
}