| # buf = n + m ⊦ #((⌜buf⌝ from n) to m) = #(⌜buf⌝ from n) ∧ (∀ n0. ⌜n0⌝ < #((⌜buf⌝ from n) to m) → ((⌜buf⌝ from n) to m)[n0] = (⌜buf⌝ from n)[n0]) |
# buf = n + m ⊦ #((⌜buf⌝ from n) to m) = #(⌜buf⌝ from n) ∧ (⌜n0⌝ < #((⌜buf⌝ from n) to m) → ((⌜buf⌝ from n) to m)[n0] = (⌜buf⌝ from n)[n0])