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Proof step 2 from proof reachable-trans-simp (previous step)

reachable(r, r0, H), reachable(r0, r1, H), r0 ∈ H, r1 ∈ H ⊦ reachable(r, r1, H)

User applied rule insert lemma

And obtained the following new goals

Rule argument

spec: inst: name: reachable-trans seq: ⊦ reachable(r, r0, H) ∧ reachable(r0, r1, H) → reachable(r, r1, H) subst: [r, r0, H, r1] → [r, r0, H, r1] flags: current, []

Additional information

Used terms: r, r0, H, r1