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Proof step 1 from proof replay-nonorphans-trunc (conclusion)
⊦ ¬ key ∈ ro → (ri ⊖ ro) \ datakeys(key, n, ri) = (ri \ datakeys(key, n, ri)) ⊖ ro
System applied rule normalize
And obtained the following new goals
Proof step 2
:
⊦ (ri ⊖ ro) \ datakeys(key, n, ri) = (ri \ datakeys(key, n, ri)) ⊖ ro, key ∈ ro
Rule argument
Additional information