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Download Fuzzy Social Choice Theory by Michael B. Gibilisco, Annie M. Gowen, Karen E. Albert, John PDF

By Michael B. Gibilisco, Annie M. Gowen, Karen E. Albert, John N. Mordeson, Mark J. Wierman, Terry D. Clark (auth.)

This e-book deals a accomplished research of the social selection literature and indicates, through utilising fuzzy units, how using fuzzy personal tastes, instead of that of strict ones, could have an effect on the social selection theorems. to do that, the publication explores the presupposition of rationality in the fuzzy framework and indicates that the 2 stipulations for rationality, completeness and transitivity, do exist with fuzzy personal tastes. particularly, this e-book examines: the stipulations less than which a maximal set exists; the Arrow’s theorem; the Gibbard-Satterthwaite theorem and the median voter theorem. After displaying non-empty maximal set does exists for fuzzy choice kin, this booklet is going directly to demonstrating the lifestyles of a fuzzy aggregation rule gratifying all 5 Arrowian stipulations, together with non-dictatorship. whereas the Gibbard-Satterthwaite theorem basically considers person fuzzy personal tastes, this paintings indicates that either participants and teams can opt for possible choices to varied levels, leading to a social selection that may be either strategy-proof and non-dictatorial. additionally, the median voter theorem is proven to carry less than strict fuzzy personal tastes yet no longer lower than susceptible fuzzy personal tastes. through offering a typical version of fuzzy social selection and through drawing the required connections among the main theorems, this e-book fills a huge hole within the present literature and encourages destiny empirical learn within the field.

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Additional info for Fuzzy Social Choice Theory

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25 demonstrates a case where ND(π , X) = ∅. For μ a fuzzy subset of X, we define the fuzzy subset nd(μ ) of X by ∀x ∈ X, nd(μ )(x) = 1 − max{π (x, y) | y ∈ Supp(μ )} . 36 3 Rationality of Fuzzy Preferences For S, a subset of X, we define ND(π , S) = {x ∈ S | nd(x) = 1} . Using ND(π , X) as a maximal set raises two significant problems. 1 illustrated, constructing a fuzzy strict preference relation can be excessively complicated and requires significant restrictions on FWPRs. Second, the definition does not make full use of fuzzy set theory, as it still views alternatives as either in or out of the set of alternatives and the set of nondominated alternatives.

Second, by the regularity assumption, ρ (xi , xi+1 ) > ρ (xi+1 , xi ) ≥ 0. Now by weak transitivity, ρ (x1 , x3 ) ≥ ρ (x3 , x1 ) because ρ (x1 , x2 ) > ρ (x2 , x1 ) and ρ (x2 , x3 ) > ρ (x3 , x2 ). Similarly, ρ (x1 , x4 ) ≥ ρ (x4 , x1 ) because ρ (x1 , x3 ) ≥ ρ (x3 , x1 ) and ρ (x3 , x4 ) > ρ (x4 , x3 ). It can now be shown that ρ (x1 , xi ) ≥ ρ (xi , x1 ) by repeating the previous argument i − 2 times. Thus, ρ (x1 , xk ) ≥ ρ (xk , x1 ). Hence π (xk , x1 ) = 0, and ρ is acyclic. (2) Suppose now that ρ is acrylic and that there exists an ordering of alternatives {x1 , x2 , x3 , .

Then, 1R (x, w) = 0. In this case, 1S (w) ∗ 1R (w, x) = 0 because R is complete and ∗ has no zero divisors. Thus, {t ∈ [0, 1] | 1S (w) ∗ 1R (w, x) ∗ t ≤ 1R (x, w)} = 0. Thus, M(1R , 1S )(x) = 0. To prove the converse, suppose R is not complete. Then there exists x, y ∈ X such that (x, y) ∈ R and (y, x) ∈ R. Let S = {x, y}. Since 1R (y, x) = 0 and 1S (z) = 0 for all z ∈ X\{x, y}, M(1S , 1R )(x) = 1S (x) ∗ {t ∈ [0, 1] | 1S (x) ∗ 1R(x, x) ∗ t ≤ 1R (x, x)} {t ∈ [0, 1] | 1S (y) ∗ 1R(y, x) ∗ t ≤ 1R (x, y)} = 1 ∗ (1 1) = 1.

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