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Require Sailfish quorums to be upward closed #241

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Require Sailfish quorums to be upward closed #241

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4 changes: 4 additions & 0 deletions specifications/dag-consensus/Sailfish.tla
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Expand Up @@ -43,6 +43,10 @@ ASSUME GSTIsARoundNumber == GST \in Nat
\* have to form a quorum, or else no round could ever be entered:
ASSUME CorrectNodesFormQuorum == IsQuorum(N \ F)

\* An additional vote cannot turn a quorum into a non-quorum.
ASSUME QuorumsAreMonotone ==
\A Q, S \in SUBSET N : IsQuorum(Q) /\ Q \subseteq S => IsQuorum(S)

\* Removing the Byzantine nodes from a quorum leaves a blocking set:
ASSUME QuorumMinusByzantineIsBlocking ==
\A Q \in SUBSET N : IsQuorum(Q) => IsBlocking(Q \ F)
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1 change: 1 addition & 0 deletions specifications/dag-consensus/TLCSailfish1.tla
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Expand Up @@ -36,6 +36,7 @@ ASSUME RoundsStartAtOne
ASSUME LeadersAreNodes
ASSUME GSTIsARoundNumber
ASSUME CorrectNodesFormQuorum
ASSUME QuorumsAreMonotone
ASSUME QuorumMinusByzantineIsBlocking
ASSUME BlockingSetsIntersectQuorums

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1 change: 1 addition & 0 deletions specifications/dag-consensus/TLCSailfish2.tla
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Expand Up @@ -34,6 +34,7 @@ ASSUME RoundsStartAtOne
ASSUME LeadersAreNodes
ASSUME GSTIsARoundNumber
ASSUME CorrectNodesFormQuorum
ASSUME QuorumsAreMonotone
ASSUME QuorumMinusByzantineIsBlocking
ASSUME BlockingSetsIntersectQuorums

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