关键词: type-2 , theory ,  of , effectivity;computability;computable ,  set;representations;
co-regular subset

Abstract:
For the computability of co-regular subsets in metric spaces, the properties of the co-regular subsets and several reasonable representations on co-regular sets have been suggested in this paper. As last, the ’weaker or stronger’ relations of these representations have been revealed.

Key words: type-2 , theory ,  of , effectivity;computability;computable ,  set;representations;
co-regular subset