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Proof step 1 from proof btree-inv-root-null-or-clean (conclusion)

r = null ∨ ¬ zh[r].dirty ⊦ istore0 ⊑ istore ∧ btree-inv(r, adr, istore, istore0, zh, ri, fi) → ri = fi

System applied rule normalize

And obtained the following new goals

Rule argument

Additional information