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Proof step 4 from proof ls-datasize-zero (previous step)

n ≤ # buf, ∀ n0. n0 < n → buf[n0] = empty ⊦ ∃ buf0. buf = mkempbuf(n) + buf0

User applied rule exists right

And obtained the following new goals

Proof step 5:
n ≤ # buf, ∀ n0. n0 < n → buf[n0] = empty ⊦ buf = mkempbuf(n) + subarray(buf, n, # buf - n)

Rule argument

pos: right 1 terms: subarray(buf, n, # buf - n) abort: F discard: T computed: F

Additional information

Used terms: subarray(buf, n, # buf - n)