(3)Recursive definition Recursive definitions of sets have three steps: 1)Basic step: Specify some of the basic elements in the set. 2)recursive step: Give some rules for how to construct more elements in the set from the elements that we know are already there. 3) closed step: There are no other elements in the set except those constructed using steps 1 and 2.(3)Recursive definition Recursive definitions of sets have three steps: 1)Basic step: Specify some of the basic elements in the set. 2)recursive step: Give some rules for how to construct more elements in the set from the elements that we know are already there . 3) closed step: There are no other elements in the set except those constructed using steps 1 and 2