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Proof step 2 from proof split-del (previous step)

p ∈ tree ⊦ tree -- (p + q) = tree[p, tree[p] -- q], q = ε

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
p ∈ tree ⊦ tree -- (p + q) = tree[p, tree[p] -- q], q = ε

Rule argument

Additional information