We consider the language of "extended subsitutions" involving both angelic and demonic choice. For other related languages expressing program semantics the implicit model of computationis based on a combination of monads by a distributive law. We show how the model of computation underlying extended subsitutions is based on a monad which, while not being a compound monad, has strong similarities to a compound monad based on a distributive law. We discuss these compound monads and monad...[Show more]
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