The postcondition command generates the postcondition of an operation expressed using the convention of a schema paragraph involving declarations with ?, ! or ' decorations in their names. The whole schema paragraph must be inspected. The result, which is displayed in the left window, is rather less interesting than that of the precondition command, as it is not possible to disentangle a postcondition from the predicate of an operation expressed in this way, and so it is just a copy of the original operation, renamed.