Information for "Independence of Smith-dominated alternatives"

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Display titleIndependence of Smith-dominated alternatives
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Page creatorBetterVotingAdvocacy (talk | contribs)
Date of page creation07:16, 22 February 2020
Latest editorRobLa (talk | contribs)
Date of latest edit09:30, 16 May 2021
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Independence of Smith-dominated alternatives (ISDA), also sometimes called Smith-IIA (Smith-Independence of Irrelevant Alternatives), says that if one option (X) wins an election, and a new alternative (Y) is added, X will still win the election if Y is not in the Smith set. ISDA implies Smith and thus Condorcet, since logically speaking, if an ISDA-passing method's winner were not in the Smith set, eliminating everyone outside of the Smith set would have to change the winner. Some Condorcet methods (e.g. Schulze) satisfy ISDA.
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