| 0 ≠ # (ar[m, bv]), m < # ar ⊦ m = 0, (ar[m, bv][0]) ' = arr2list(ar, 0) |
m < # ar ⊦ m = 0, ar[0] ' = arr2list(ar, 0)
[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ m < n → n ≠ 0], [CSIMPSEQ : ⊦ # (ar[n, bv]) = # ar], [CSIMPSEQ : ⊦ m ≠ n → (ar[n, bv][m] ↔ ar[m])])]]