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</script>This chapter continues the description of checkers started in Chap 9. It focuses on the application of checkers to formal verification—composing non-deterministic abstract models. The main feature in checkers supporting non-determinism are free variables, which are introduced in this chapter. We also introduce a special case of free variables: constant free variables, also called rigid variables. We show how free and rigid variables can be used as an alternative to local variables, and discuss advantages and drawbacks of each approach. Another topic addressed in this chapter is the use of checkers as a synthesizable testbench—a DUT environment model supported both in simulation and in formal verification.
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