Re: [isabelle] code generation for saturated naturals

Btw. theory src/HOL/Library/Dlist.thy is a very nice example how to
establish what you could call »abstract types with invariants« and
corresponding code generation in Isabelle/HOL.
I suggest to follow the patterns which can be found there wrt.
to which auxiliary lemmas about Rep/Abs/Abs' to prove, which simp rules
to prove
and how to setup code generation.

Maybe your Abs_sat' can just be called Sat.




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