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Reversal symmetry
Reversal symmetry is a voting system criterion which requires that if candidate A is the unique winner, and each voter's individual preferences are inverted, then A must not be elected. Methods that satisfy reversal symmetry include Borda count, the Kemeny-Young method, and the Schulze method. Methods that fail include Bucklin voting, instant-runoff voting and Condorcet methods that fail the Condorcet loser criterion such as Minimax.
For cardinal voting systems which can be meaningfully reversed, approval voting and range voting satisfy the criterion.
==Examples==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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