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Proof step 1 from proof not-garbage-valid-imp-empty (conclusion)

⊦ aehdr ≠ garbage → (aehdr.valid? ↔ aehdr ≠ empty)

System applied rule normalize

And obtained the following new goals

Proof step 2:
⊦ aehdr.valid? ↔ aehdr ≠ empty, aehdr = garbage

Rule argument

Additional information