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Multiagent Systems

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Prof. Dr. Jürgen Dix · Department of Informatics, TUC <strong>Multiagent</strong> <strong>Systems</strong>, WS 06/07 272/731<br />

4. Decision Making (2) 1. Voting<br />

What are fair conditions for an election process?<br />

Note that our preferences are total.<br />

Definition 4.5 (Unanimity, Monotonicity)<br />

A social choice C ∗ function satisfies unanimity, if for any<br />

profile l = (≺ 1 , . . . , ≺ |A| ), v ∈ V and outcome o ∈ v:<br />

If for all 1 ≤ i ≤ |A| : o = max ≺ i<br />

then C ∗ (v, l) = o<br />

A social choice C ∗ function satisfies monotonicity, if for<br />

any profile l = (≺ 1 , . . . , ≺ |A| ), v ∈ V and outcome<br />

o = C ∗ (v, l) ∈ v: if l ′ == (≺ ≺ ′ 1, . . . ,≺ ≺ ′ |A|) is a different profile<br />

such that for all o ′ and i<br />

o ′ ≺ i o implies o ′ ≺ ′ io<br />

then C ∗ (v, l ′ ) = o.

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