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Proof step 1 from proof tr-fold-singleton (conclusion)

⊦ r => mknode(null, a, null) = tr(r, branch(leaf, a, leaf))

User applied rule expand right

And obtained the following new goals

Proof step 2:
⊦ ((r => mknode(null, a, null)))(H) ↔ tr(r, branch(leaf, a, leaf))(H)

Rule argument

pos: right 1

Additional information