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Proof step 60 from proof soundness-rec (conclusion)

x ≠ [], x = x0, i ≤ j, max(x) ≤ j ⊦ 〈build_rec#(i; x, to)〉 (to ≠ fail → x0 = depths(to .t, i) + x)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 59:
x = x0, x0 ≠ [], i ≤ j, max(x0) ≤ j ⊦ 〈build_rec#(i; x, to)〉 (to ≠ fail → x0 = depths(to .t, i) + x)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]