A geometric pumping technique for 2-VASS is developed to reprove an exponential bound on shortest accepting runs and establish a new pumping lemma for their languages.
Reachability in two- dimensional unary vector addition systems with states is NL-comple te
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New Pumping Technique for 2-dimensional VASS
A geometric pumping technique for 2-VASS is developed to reprove an exponential bound on shortest accepting runs and establish a new pumping lemma for their languages.