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Proof step 3 from proof depths-one (previous step)

depths(t, i) = j ', i ≠ j ∨ t ≠ Leaf ⊦ # depths(t, i) = 1, t = Leaf

User applied rule insert equation

And closed the goal!

Rule argument

[inserteqarg: pos: left 1,F,T,()]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ # d ' = 0 +1])]]