Proof of the invariant from other invariants.
The key theorem that we use is dag-omni-paths-p-holds. We use already proved invariant to establish its hypotheses.
Theorem:
(defthm omni-paths-p-implied (implies (and (backward-closed-p systate) (signer-quorum-p systate) (unequivocal-dags-p systate) (same-committees-p systate) (dag-previous-quorum-p systate) (last-anchor-voters-p systate)) (omni-paths-p systate)))