Bisimulations that abstract from internal computation have proven to be useful for verification of compositionally defined transition system. In the literature of probabilistic extensions of such transition systems, similar bisimulations are rare. In this paper, we introduce weak bisimulation and branching bisimulation for transition systems where nondeterministic branching is replaced by probabilistic branching. In contrast to the nondeterministic case, both relations coincide. We give an algorithm to decide weak bisimulation with a time complexity cubic in the number of states of the transition system. This meets the worst case complexity for deciding branching bisimulation in the nondeterministic case.
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