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Proof step 20 from proof decode-contract (previous step)

n < # buf, n0 < n + ENCODED_ELEM_SIZE, n0 < # buf, is-encoded(a, subarray(buf, n, ENCODED_ELEM_SIZE)), n ≤ n0, n + ENCODED_ELEM_SIZE ≤ # buf, ∀ n1. n1 < ENCODED_ELEM_SIZE → buf[n + n1] = empty ⊦ buf[n0] = empty

User applied rule all left

And obtained the following new goals

Proof step 21:
n0 < # buf, n0 < n + ENCODED_ELEM_SIZE, n < # buf, is-encoded(a, subarray(buf, n, ENCODED_ELEM_SIZE)), n + ENCODED_ELEM_SIZE ≤ # buf, n ≤ n0, n0 - n < ENCODED_ELEM_SIZE → buf[n + (n0 - n)] = empty ⊦ buf[n0] = empty

Rule argument

pos: left 7 terms: n0 - n abort: F discard: T computed: F

Additional information

Used terms: n0 - n