safety proof of EWD687a#215
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Signed-off-by: Stephan Merz <stephan.merz@loria.fr>
lemmy
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Jul 20, 2026
| (* there is no need to change upEdge[p] in the Idle subaction. *) | ||
| (***************************************************************************) | ||
| Idle(p) == /\ active' = [active EXCEPT ![p] = FALSE] | ||
| Idle(p) == /\ active[p] \* otherwise this step is subsumed by stuttering |
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I suggest elaborating on why this is an issue.
lemmy
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Jul 20, 2026
| /\ O.edge # {} => G!IsTreeWithRoot(O, Leader) | ||
| \* All nodes of the overlay tree are non-neutral. | ||
| /\ N:: \A n \in O.node: ~neutral(n)) | ||
| \* The original definition includes every node occurring in the tree |
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The comment about the original definition can likely be omitted.
lemmy
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Jul 20, 2026
| P3 = P3 | ||
| \* MV CONSTANT definitions | ||
| MaxCounter = 3 | ||
| Leader = L |
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Can the reduction of proof effort be soley attributed to the introduction of GraphTheorems? |
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Updated EWD687a according to the changes in the Graphs community module, and contributed a proof of the safety property of the algorithm.