Byzantine Quorum Intersection
In a 3f+1 system, quorums of size 2f+1 intersect in at least f+1 replicas, so any two quorums share at least one correct replica even if all f faulty nodes sit in the intersection. This single honest witness in every intersection is what carries safety across phases and across view changes.
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In a 3f+1 system, quorums of size 2f+1 intersect in at least f+1 replicas, so any two quorums share at least one correct replica even if all f faulty nodes sit in the intersection. This single honest witness in every intersection is what carries safety across phases and across view changes.
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