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Proof step 1 from proof free-unknown (conclusion)

((r =>_ * P))(H) ⊦ ⟪free(r; H)⟫ P(H)

Heuristic weak unfold applied rule call right

And obtained the following new goals

Proof step 2:
((r =>_ * P))(H) ⊦ ⟪if ¬ r ∈ H then abort else H := H -- r⟫ P(H)

Rule argument

pos: right 1

Additional information

Used simplifier rules: free(r; H){if ¬ r ∈ H then abort else H := H -- r};