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Proof step 7 from proof rev-at (previous step)

# ar = n0 + n + 1, n < # ar ⊦ rev(ar, # ar)[n] = ar[n0]

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 8:
⊦ m < n ∧ n ≤ # ar → rev(ar, n)[m] = ar[# ar - m + 1]
Proof step 9:
# ar = n0 + n + 1, n < # ar, # ar ≤ # ar ⊦ ar[# ar - n + 1] = ar[n0]

Rule argument

spec: <toplevel> name: rev-at-h seq: ⊦ m < n ∧ n ≤ # ar → rev(ar, n)[m] = ar[# ar - m + 1] subst: [m, n, ar] → [n, # ar, ar] flags: <all paths>

Additional information

Used simplifier rules: ⊦ m ≤ m; (s) Used terms: n, # ar, ar