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Proof step 1 from proof read-known (conclusion)

((r => o0 * P))(H) ⊦ ⟪read(r, H; o1)⟫ (o0 = o1)

Heuristic weak unfold applied rule call right

And obtained the following new goals

Proof step 2:
((r => o0 * P))(H) ⊦ ⟪if ¬ r ∈ H then abort else o := H[r]⟫ (o0 = o)

Rule argument

pos: right 1

Additional information

Used simplifier rules: read(r, H; o){if ¬ r ∈ H then abort else o := H[r]};