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Proof step 6 from proof read-get (previous step)

n ≤ # ax0, ∀ n, fs. n < # ax0 → fs[ax0][n] = fs[ax0[n]] ∨ ax0 = [] ⊦ fs[ax0][n - # fs[adr] '] = fs[(adr ' + ax0)[n]], n < # fs[adr] '

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 7:
n ≤ # ax0, ∀ n, fs. n < # ax0 → fs[ax0][n] = fs[ax0[n]] ∨ ax0 = [] ⊦ fs[ax0][n - 1] = fs[(adr ' + ax0)[n]], n = 0

Rule argument

Additional information

Used simplifier rules: ⊦ m < 1 ↔ m = 0; (s)% ⊦ # nd ' = 0 +1; (s)