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Proof step 1 from proof dnode-elim-strong (conclusion)

⊦ tree.dir? ↔ (∃ md, sdt. tree = dnode(md, sdt))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ dnode(md, sdt).dir?
Proof step 3:
tree.dir? ⊦ ∃ md, sdt. tree = dnode(md, sdt)

Rule argument

Additional information

Used simplifier rules: isdnode: ⊦ dnode(md, sdt).dir?;