Read e-book online Basic Geometry of Voting PDF

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By Donald G. Saari

ISBN-10: 3540600647

ISBN-13: 9783540600640

ISBN-10: 3642577482

ISBN-13: 9783642577482

A shock is how the complexities of balloting idea should be defined and resolved with the cozy geometry of our third-dimensional international. This booklet is directed towards scholars and others wishing to profit approximately balloting, specialists will detect formerly unpublished effects. to illustrate, a brand new profile decomposition quick resolves centuries previous controversies of Condorcet and Borda, demonstrates, that the scores of pairwise and different equipment vary simply because they depend upon diversified info, casts sequence doubt at the reliability of a Condorcet winner as a typical for the sphere, makes the well-known Arrow`s Theorem predictable, and simplifies the development of examples. The geometry unifies possible disparate themes as manipulation, monotonicity, or even the apportionment problems with the U.S. excellent Court.

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Additional resources for Basic Geometry of Voting

Example text

1) j=l The host space R+! ), the space of normalized profiles, to a n! -1 dimensional geometric object. We have a serious problem. Already with three candidates we need a 3! = 6 dimensional space where the profile space is five-dimensional. With a few more candidates, say n = 10, we must deal wi~h a 10! -1 = 518,399 dimensional space of profiles! Now, it is trivial to draw one-dimensional objects, a bit harder to draw a two-dimensional figure, and, with practice, artistically talented people can create a recognizable two-dimensional drawing of a three-dimensional figure.

Voters, millions upon millions of different voter arrangements emerge. 1 RANKING REGIONS techniques are counter-productive - as when a collapsing shelf dumps dirty underwear, several partially completed manuscripts, and an unstrung tennis racket upon a stunned guest. Similarly, mathematical structures can fill the spaces between the integers in highly imaginative ways. Some are useful, but others share striking similarities with the closet shelf; they can dump irrelevant, unwanted structures on us.

When an opportunity for a debate exists, it usually generates one - particularly in academic circles. " "Why not use, say, 4, 1, 0, or 5, 4, 17" Justifications for the BC weights were offered by Borda and by Laplace, but their philosophical responses are not satisfying; the questions remain. Another fault of Borda's method, as shown in the fable, is that the BC can be manipulated. The reported reaction from Borda asserting that his method is intended only for honest people is lame (Chap. 2 of [BI]); anyway, we now know that all methods can be manipulated.

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Basic Geometry of Voting by Donald G. Saari

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