Variants of essential arity for partial functions
          Lehtonen, Erkko; Lekkoksung, Nareupanat  
          
          Kyungpook Mathematical Journal, 60 (2020), 423–443  
          http://doi.org/10.5666/KMJ.2020.60.3.423  
           
          Generalizations of essential arity of partial functions, based on essential sets of arguments, are introduced, and their interplay with the minor relation of functions is investigated.  
         |