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Proof step 4 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 3:
(r => o0 * P)(H) ⊦ ⟪o := o1⟫ ⟪if ¬ r ∈ H then abort else o := H[r]⟫ o0 = o

Rule argument

[fmapos-arg: pos: right 1]

Additional information

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