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