| x = i + x1, ∀ x0. # x0 < # x → (true → x0 = [] ∨ min(x0) ∈ x0) ⊦ x = [], min(x) ∈ x |
∀ x0. # x0 < # (i + x1) → (true → x0 = [] ∨ min(x0) ∈ x0) ⊦ min(i ' + x1) = i, min(i ' + x1) ∈ x1
[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ ¬ d ∈ d0 ' + x ↔ d ≠ d0 ∧ ¬ d ∈ x], [CSIMPSEQ : ⊦ (x + y) + z = x + y + z], [CSIMPSEQ : ⊦ d ' + x ≠ []], [CSIMPSEQ : ⊦ d + x = d ' + x])]]