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

ce.nxt = H[r1].nxt, path(r ' + x, H) ⊦ ∃ x0. path(r ' + x0, H[r1, ce]) ∧ (r ' + x0).last = (r ' + x).last

User applied rule exists right

And obtained the following new goals

Proof step 9:
ce.nxt = H[r1].nxt, path(r ' + x, H) ⊦ path(r ' + x, H[r1, ce]) ∧ (r ' + x).last = (r ' + x).last

Rule argument

pos: right 1 terms: x abort: F discard: T computed: T

Additional information

Used terms: x