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Proof step 1 from proof inj-put-01 (conclusion)
⊦ a ≠ b → (st[a, d][b, d0] = st[b, d0] ↔ a ∈ st ∧ st[a] = d)
System applied rule normalize
And obtained the following new goals
Proof step 2
:
⊦ st[a, d][b, d0] = st[b, d0] ↔ a ∈ st ∧ st[a] = d, a = b
Rule argument
Additional information