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ZoƩ Christoff edited section_Convergence_label_sec_convergence__.tex
about 8 years ago
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%But it is also interesting to characterize the class of opinion profiles on which \emph{any} influence graph would make the resulting opinion stream converge:
\begin{lemma}\label{lemma:opinion}
Let $\G$ be an influence profile and
$\O=(O_1,\dots,O_n)$ $\O$ be an opinion profile. Then the following are equivalent:
\begin{itemize}
\item[] The BDP converges for $\O$ on $\G$.
\item[] For all $p\in \Atoms$, there is no set of agents $C\subseteq\N$ such that: $C$ is a cycle in $G_{p}$ and there are two agents $i,j\in C$ such that $O_i(p)\neq O_j(p)$.
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Combining the above results we obtain:
\begin{theorem} \label{theorem:convergence}
Let $\G$ be an influence profile and
$\O=(O_1,\dots,O_n)$ $\O$ be an opinion profile. The BDP converges for $\O$ on $\G$ if and only if:
\begin{itemize}
\item[] For all $p\in\Atoms$, $G_p$ contains no cycle of length $\geq 2$, or
\item[] For some $p\in\Atoms$, there is a set of agents $C\subseteq\N$ such that: $C$ is a cycle in $G_{p}$ and there are two agents $i,j\in C$ such that $O_i(p)\neq O_j(p)$.