Аннотация
We study bootstrap percolation with the threshold parameter \$2\$
and the initial probability \$p\$ on infinite periodic trees that are defined as
follows. Each node of a tree has degree selected from a finite predefined set
of non-negative integers and starting from any node, all nodes at the same
graph distance from it have the same degree. We show the existence of the
critical threshold \$p\_f(þeta) (0,1)\$ such that with high probability, (i)
if \$p > p\_f(þeta)\$ then the periodic tree becomes fully active, while (ii) if
\$p < p\_f(þeta)\$ then a periodic tree does not become fully active. We also
derive a system of recurrence equations for the critical threshold
\$p\_f(þeta)\$ and compute these numerically for a collection of periodic trees
and various values of \$þeta\$, thus extending previous results for regular
(homogeneous) trees.
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