Abstract. In many situations, we would like to check whether an algorithmically given mapping f : A → B is injective, surjective, and/or bijective. These properties have a practical meaning: injectivity means that the events of the action f can be, in principle, reversed, while surjectivity means that every state b ∈ B can appear as a result of the corresponding action. In this paper, we discuss when algorithms are possible for checking these properties.
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