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Proof step 2 from proof reachnext (previous step)

⊦ reachable(r0, H[r0].nxt, H) ↔ r0 ≠ null ∧ r0 ∈ H ∧ H[r0].nxt ∈ H ∧ H[r0].nxt ≠ null

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 3:
⊦ reachable(r, r0, H) ↔ (∃ x. path(r ' + x, H) ∧ (r ' + x).last = r0)
Proof step 4:
⊦ (∃ x. path(r0 ' + x, H) ∧ (r0 ' + x).last = H[r0].nxt) ↔ r0 ≠ null ∧ r0 ∈ H ∧ H[r0].nxt ∈ H ∧ H[r0].nxt ≠ null

Rule argument

spec: inst: name: reachable-def seq: ⊦ reachable(r, r0, H) ↔ (∃ x. path(r ' + x, H) ∧ (r ' + x).last = r0) subst: [H, r0, r] → [H, H[r0].nxt, r0] flags: rewrite, current

Additional information

Used terms: H, H[r0].nxt, r0