Safety checking over tree topologies with fixed phases is EXPSPACE-complete and with variable phases is 2EXPSPACE-complete; depth bounds yield complexities in the fast growing hierarchy.
Parameterized tree systems
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On Parameterized Verification Over Tree Topologies
Safety checking over tree topologies with fixed phases is EXPSPACE-complete and with variable phases is 2EXPSPACE-complete; depth bounds yield complexities in the fast growing hierarchy.