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Proof step 9 from proof rev-rev (previous step)

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

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 10:
⊦ n < # ar → rev(ar)[n] = ar[# ar - n + 1]
Proof step 11:
# ar = n0 + n + 1, n < # ar ⊦ rev(ar)[n0] = ar[n], n0 < # ar
Proof step 13:
# ar = n0 + n + 1, n < # ar, n0 < # ar ⊦ ar[# ar - n0 + 1] = ar[n]

Rule argument

spec: <toplevel> name: rev-at seq: ⊦ n < # ar → rev(ar)[n] = ar[# ar - n + 1] subst: [n, ar] → [n0, ar] flags: <all paths>

Additional information

Used terms: n0, ar