= Global survival threshold of the contact process
{title2=$\lambda_1=\inf\{\lambda:\mathbb P_\lambda(\xi_t^{\{x\}}\ne\varnothing\ \forall t) >0\}$}
This is the critical infection rate for the <contact process> started from one infected site to avoid its absorbing empty state forever. It concerns infection somewhere in the <graph> at all times, rather than repeated infection of a fixed site. On a transitive <graph> it is independent of the starting site. Infection-arrow inclusion couples different rates monotonically.
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