Material for Lecture4:
    • An Overview of Generate & Check Method in CafeOBJ (slides in a pdf file)
    • Generic Sequence Spec (text file with .cafe extension)
    • Generic Set Spec (text file with .cafe extension)
    • System Specification of QLOCK (text file with .cafe extension)
    • Property Specification of QLOCK (text file with .cafe extension)
    • Proof Score for Initial Condition (text file with .cafe extension)
    • Proof Score for Inductive Invariant Condition (text file with .cafe extension)
        The above 6 files of CafeOBJ codes (text file with .cafe extension) are supposed to be in the same directory.