[isabelle] formalising abstract machines



Hi,

I am formalising an abstract machine. For being able to prove pattern completeness, I defined the function to evalute to

    value option

and added a last clause that returns None if all the other patterns fail.

But it is not clear how this interplays with

   abstract_machine_dom arguments => (abstract_machine arguments) meets specification

type theorems. Would it be better to simply make an infinite recursive call as a last pattern?

| abstract_machine arguments = abstract_machine arguments

letting it not to terminate at all?

What is the standard way of defining an interpreter and its partial correctness in Isabelle?

Cheers

- Gergely





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