Logical opposition and collective decisions

In Jean-Yves Béziau & Dale Jacquette (eds.), Around and Beyond the Square of Opposition. Springer 341--356 (2012)
The square of opposition (as part of a lattice) is used as a natural way to represent different and opposite ways of who makes decisions, and in what way, in/for a group or a society. Majority logic is characterized by multiple logical squares (one for each possible majority), with the “discursive dilemma” as a consequence. Three-valued logics of majority decisions with discursive dilemma undecided, of veto, consensus, and sequential voting are analyzed from the semantic point of view. For instance, the paraconsistent and paracomplete logics M3, M3veto and C3 are described. The distinction of designated and non-designated values is not used, and instead, the consequence relation is defined as a preservation of the minimum truth-value of the implying set of sentences. The consequence and opposition relations of the logics described are compared, and an ordering of the logics with respect to their opposition relations is established.
Keywords collective decision  discursive dilema  hexagon of opposition  majority  three-valued logic
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Author unknown, Square of Opposition. Internet Encyclopedia of Philosophy.
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