[tlaplus] Re: How to understand the concept "step simulation"

[Oliver Yang <olilent2ctw@xxxxxxxxx>]

Any suggestion will be much appreciated : )

On Wednesday, March 6, 2019 at 10:53:35 PM UTC-8, Oliver Yang wrote:

Hi All,

In Section 5.8 of book "Specifying Systems", the "Proving Impl" is introduced. I have a rough understanding of refinement mapping, which

essentially maps states of Spec A to the states of Spec B. However, I have a hard time understanding "step simulation".

1) What's the purpose of introducing the invariant Inv in Formula 5.3? What are we trying to achieve here?

2) How do we derive the mapping: omem = vmem, octl = ..., obuf = buf? It looks like we jumped to the conclusion without showing any proof?

Thanks,

Oliver

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