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Proof step 4 from proof Del-rec-other (previous step)

⊦ str = str0, ∀ str1. (str1 ∈ sdt[str0, tree] -- str ↔ str1 ∈ (sdt -- str)[str0, tree]) ∧ (sdt[str0, tree] -- str)[str1] = (sdt -- str)[str0, tree][str1]

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
⊦ str = str0, (str1 ∈ sdt[str0, tree] -- str ↔ str1 ∈ (sdt -- str)[str0, tree]) ∧ (sdt[str0, tree] -- str)[str1] = (sdt -- str)[str0, tree][str1]

Proof step 4 from proof Del-rec-other (previous step)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

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