Independent necessary and sufficient conditions for approval voting

@inproceedings{Baigent1991IndependentNA,
  title={Independent necessary and sufficient conditions for approval voting},
  author={Nick Baigent and Yongsheng Xu},
  year={1991}
}
Abstract The following axioms are imposed on aggregations of choice functions: Unrestricted Domain (U), Neutrality (N), Independence of Symmetric Substitutions (ISS), Anonymity (A) and Positive Response (PR). Approval Voting is characterized by (U), (N), (ISS) and (PR); these axioms are independent. In the presence of (U), (N) and (PR), (ISS) is strictly stronger than (A). Plurality Voting is characterized by strengthening (U) along with (N), (ISS) and (PR).