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Proof step 4 from proof free-known (conclusion)

(r => o * P)(H) ⊦ ⟪free(r; H)⟫ P(H)

Heuristic weak unfold applied rule call right

And obtained the following new goals

Proof step 3:
(r => o * P)(H) ⊦ ⟪H0 := H⟫ ⟪if ¬ r ∈ H0 then abort else H0 := H0 -- r⟫ P(H0)

Rule argument

[fmapos-arg: pos: right 1]

Additional information

[[CONCRETESIMPRULES : ([CSIMPDECL : free (r; H) { if ¬ r ∈ H then abort else H := H -- r }])]]