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Proof step 8 from proof self-reachable (previous step)

r ∈ H ⊦ r = null, ∃ x. path(r ' + x, H) ∧ (r ' + x).last = r

User applied rule exists right

And closed the goal!

Rule argument

pos: right 2 terms: [] abort: F discard: T computed: F

Additional information

Used simplifier rules: path-one: ⊦ path(r ', H) ↔ ¬ ¬(r ∈ H ∧ r ≠ null);%app: ⊦ x0 + [] = x0; from specification list[reflist]%a: ⊦ (x0 + x1) + x2 = x0 + x1 + x2; from specification list[reflist]%l: ⊦ r '.last = r; from specification list-last[reflist] Used terms: []