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Proof step 1 from proof okfieldinits-at (previous step)

⊦ okfieldinits(class, (sk × val) ' + fis) ↔ is_fskey(sk) ∧ val = initial_value(sk .fs .type) ∧ sk .fs .class = class ∧ sk .fs .type ≠ abstract_type ∧ okfieldinits(class, fis)

Lemma okfieldinits-rec