| st.min ∈ st, st.keys.min ∈ st → ¬ st.keys.min < st.min ⊦ st.min = st.keys.min, st = ∅ |
st.min < st.keys.min, st.min ∈ st ⊦ st.min = st.keys.min, st = ∅
Used simplifier rules: mk-in: ⊦ st ≠ ∅ → (st.keys.min ∈ st ↔ true);% ⊦ a ≠ b → (a < b ↔ ¬ b < a); (ss)