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ZoƩ Christoff edited This_example_shows_that_direction__.tex
almost 8 years ago
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Consider an arbitrary issue $p\in \Atoms$, and an arbitrary agent $i\in \N$. $i$ is at some distance $k$ from some agent $l$ in a cycle $C$ of $G_p$. We show that for any $k\in\mathbb{N}$, $O_i(p)$ stabilizes.
\begin{itemize}
\item If $k=0$: $i$ is in the cycle $C$, hence $\O_{i}(p)$ is already stable.
\item if $k=n$: Assume that for agent $j$ at distance $n-1$ from agent $l$, $j$'s opinion on $p$
stabilizes, that is, stabilizes: for some $m \in \mathbb{N}$, $O^{m}_ j(p)$ is stable.
We need to consider the following cases:
\begin{itemize}
\item
if If $\bigwedge_{p \in \Atoms} \O^{m}_{R_p(i)}(p) \wedge \bigwedge_{\varphi \in \C}$ is consistent,
then $\O^{m+1}_i(p)=\O^m_j(p)$, and $\O^{m+1}_i(p)$ is stable.
\item
if If $\bigwedge_{p \in \Atoms} \O^{m}_{R_p(i)}(p) \wedge \bigwedge_{\varphi \in \C}$ is not consistent,
then then:
\begin{itemize}
\item if $\O^{m}_i(p)=\O^m_j(p)$, $\O^{m}_i(p)$ is stable.
\item if $\O^{m}_i(p) \neq O^m_j(p)$,
$\O^{m+1}_j(p) $\O^{m+1}_i(p) =
\O^{m}_j(p)$. \O^{m}_i(p)$: $i$ does not change his opinion at stage $m+1$ but nothing guarantees that this won't change later
on. Consider the two possible subcases: on:
\begin{itemize}
\item If there is a $t\in\mathbb{N}$ such that $\bigwedge_{p \in \Atoms} \O^{m}_{R_p(i)}(p) \wedge \bigwedge_{\varphi \in \C}$ is consistent, then $\O^{m+t+1}_i(p) = \O^{m}_j(p)$, and $\O^{m+t+1}_i(p)$ is stable.
\item If there is no such $t$, then $i$'s opinion on $p$ will never change: $\O^{m}_i(p)$ is stable.