We describe hybrid observational transition systems, or HOTSs. HOTSs are written in terms of equations and verified by means of equational reasoning. More concretely, CafeOBJ, an algebraic specification language, is used to specify HOTSs and verify that HOTSs have properties by writing proofs, or proof scores. One case study is used to demonstrate how to model hybrid systems as HOTSs, specify HOTSs in CafeOBJ and verify that HOTSs have properties with the CafeOBJ system.

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