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Proof step 7 from proof k-reachable-def (previous step)

path(r ' + x, H) ⊦ r = null, ∃ n. reachable-n(H, n, r, (r ' + x).last)

Heuristic weak cut applied rule cut formula

And obtained the following new goals

Proof step 8:
x = [], path(r ' + x, H) ⊦ r = null, ∃ n. reachable-n(H, n, r, (r ' + x).last)
Proof step 10:
path(r ' + x, H) ⊦ x = [], r = null, ∃ n. reachable-n(H, n, r, (r ' + x).last)

Rule argument

fma: x = []

Additional information

Used formulas: x = []