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Proof step 2 from proof good-field-field-02 (conclusion)

⊦ goodfieldandtype(r, fs ', st) ↔ r -- fs ' ∈ st ∧ okval(st[r -- fs '], fs .type)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 1:
⊦ goodfieldandtype(r, fs ', st) ↔ ¬ ¬ (r -- fs ' ∈ st ∧ okval(st[r -- fs '], fs .type))

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]