I noticed that you were writing
 rewrite_tac [z_get_spec %SZT% pre Op %>%]
to rewrite the pre operator away. In some cases this would leave Op in the result which you would then need to rewrite away again. It's probably better to just do
 rewrite_tac [z_get_spec %SZT% Op %>%]
and let the z_library proof context simplify
 pre [... | ...]
automatically.

Phil

Artur Oliveira Gomes wrote:
Hi there,

I am having few problems with the precondition calculus. More specifcly,
I can not say if an existential quantifier included in the predicate of the operation can be eliminated during the calculus, or if it is the precondition itself.

Here follows an attached file with a small example of what I am trying to do.

Best regards,

--
Artur Oliveira Gomes
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