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Proof step 5 from proof head-corr (previous step)

buf .len = 1 + n→i(# x), a ' + x = tolist(buf, i→n(buf .len)), inv(buf), a2 = a0 ∧ ar0 = buf .data ∧ i0 = buf .first, 0 ≤ i0 ∧ i0 < n→i(# ar0), a ≠ ar0[i→n(i0)] ⊦

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 4:
a ' + x = tolist(buf, i→n(buf .len)), buf .len = 1 + n→i(# x), 0 ≤ buf .first, buf .first < n→i(# buf .data), inv(buf) ⊦ a = (buf .data)[i→n(buf .first)], # buf .data = 0

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ 0 < m ↔ m ≠ 0], [CSIMPSEQ : 0 ≤ i ⊦ ((* i)) < n→i(n) ↔ i→n(i) < n], [CSIMPFORWARD : ⊦ i ≤ j ∧ 0 ≤ i → 0 ≤ j], [CSIMPFORWARD : ⊦ i < j ∧ 0 ≤ i → 0 < j])]]