Symbolic simulation uses variables to stand for unknown values.
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Implementation techniques include state space enumeration, symbolic state space enumeration, abstract interpretation, symbolic simulation, abstraction refinement.
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Because symbolic simulation can cover many system executions in a single simulation, it can greatly reduce the size of verification problems.
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"' Symbolic simulation "'is a form of simulation where many possible executions of a system are considered simultaneously.
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Techniques such as symbolic trajectory evaluation ( STE ) and generalized symbolic trajectory evaluation ( GSTE ) are based on this idea of symbolic simulation.
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Bryant's 1986 paper on symbolic circuits by symbolic simulation, with levels of abstraction ranging from transistors to very high-level representations.