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Proof step 5 from proof depths-nonnil (previous step)

depths(t, i) = [] ⊦

User applied rule structural induction

And obtained the following new goals

Proof step 1:
⊦ depths(Leaf, i) = i '
Proof step 4:
∀ i. depths(t0, i) ≠ [], ∀ i. depths(t1, i) ≠ [], depths(Node(t0, t1), i) = [] ⊦

Rule argument

[VARWITHVARSEQSARG : t, ()]

Additional information

[[CONCRETESIMPRULES : ([CSIMPGEN : tree generated by leaf, node;], [CSIMPSEQ : ⊦ d ' ≠ []])]]