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Proof step 1 from proof at-overwrite-content-old-cut (conclusion)
⊦ ¬ n ∈ content → (content0 ⊕ content)[n] = content0[n]
System applied rule normalize
And obtained the following new goals
Proof step 2
:
⊦ (content0 ⊕ content)[n] = content0[n], n ∈ content
Rule argument
Additional information