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Proof step 12 from proof rev-rev (previous step)

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

User applied rule insert equation

And closed the goal!

Rule argument

pos: left 1 flags: discard

Additional information

Used simplifier rules: ⊦ m + m0 ≤ m ↔ m0 = 0; (s)% ⊦ m + 1 ≠ 0; (s)%a: ⊦ (m + n0) + n1 = m + n0 + n1; from specification nat-basic%c: ⊦ m + n = n + m; from specification nat-basic