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Proof step 2 from proof append-from-gr-01 (previous step)

# x < m ⊦ ⌜x⌝ + σ from m = σ from (m - # x)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
# x < m ⊦ ⌜x⌝ + σ from m = σ from (m - # x)

Rule argument

Additional information

Used simplifier rules: ⊦ m < n → n ≠ 0; (s)%f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic