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Proof step 1 from proof append-inj (conclusion)
⊦ # ar0 = # ar1 → (ar0 + ar = ar1 + ar2 ↔ ar0 = ar1 ∧ ar = ar2)
System applied rule normalize
And obtained the following new goals
Proof step 2
:
# ar0 = # ar1 ⊦ ar0 + ar = ar1 + ar2 ↔ ar0 = ar1 ∧ ar = ar2
Rule argument
Additional information