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Proof step 1 from proof mk-in (conclusion)
⊦ st ≠ ∅ → (st.keys.min ∈ st ↔ true)
System applied rule normalize
And obtained the following new goals
Proof step 2
:
⊦ st.keys.min ∈ st ↔ true, st = ∅
Rule argument
Additional information