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Proof step 16 from proof ismin (previous step)

t1 .leftmost ∈ t1, b < t1 .leftmost, bst(t2), bst(t1), b ∈ t2, ∀ a, c. a ∈ t1 ∧ c ∈ t2 → a < c, ∀ a0. ¬ a0 ∈ t1 ∨ ¬ a0 ∈ t2, ∀ a0. a0 ∈ t2 → a < a0, ∀ a0. a0 ∈ t1 → a0 < a, ∀ t0, b. # t0 < # branch(t1, a, t2) → (bst(t0) ∧ b ∈ t0 ∧ b < t0 .leftmost → b = t0 .leftmost ∨ t0 = leaf) ⊦ t1 = leaf, b = t1 .leftmost

Heuristic quantifier closing applied rule all left

And obtained the following new goals

Proof step 15:
⊦ t ≠ leaf → (¬ t .leftmost ∈ t ↔ false)

Rule argument

[EXRARG : pos: left 6, [QUANTTERMLIST : (t1 .leftmost, b)]]

Additional information

[[CONCRETESIMPRULES : ([CSIMPFORWARD : ⊦ a < b ∧ b < c → a < c], [CSIMPSEQ : ⊦ ¬ a < a])], [EXTRATERMS : (t1 .leftmost, b)]]