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Proof step 12 from proof add-preserves-reachable (
previous step
)
⊦ ¬ reachable(r, r0, H) ∧ reachable(r, r1, H) ∧ r0 ≠ null ∧ r0 ∈ H → (¬ reachable(r, r1, H[r0, ce]) ↔ false)
Lemma
modnotreachable-reachable-weak