Problem packetResearch packetR325
Literature and finite-state audit
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The record cites sources for its explanation. The outcome applies to this attempt's recorded scope.
Attempt outcome: in progress
Recorded scope: connected visited sets and starting symmetry orbits for simple random walk on P_4 square P_5
Complete recorded scope and conditions
{
"kind": "bounded",
"statement": "connected visited sets and starting symmetry orbits for simple random walk on P_4 square P_5",
"bounds": {
"rows": {
"min": 4,
"max": 4
},
"columns": {
"min": 5,
"max": 5
},
"connected_nonempty_subsets": {
"min": 116166,
"max": 116166
}
},
"exhaustive": true
}Originating problem: Largest expected cover time on the four by five grid
Authored record and scope
- Authored title
- Literature and finite-state audit
- Record type
- attempt
- Stored status
- in_progress
- Evidence grade
- sourced
- Recorded scope data
- { "kind": "bounded", "statement": "connected visited sets and starting symmetry orbits for simple random walk on P_4 square P_5", "bounds": { "rows": { "min": 4, "max": 4 }, "columns": { "min": 5, "max": 5 }, "connected_nonempty_subsets": { "min": 116166, "max": 116166 } }, "exhaustive": true }
Work and source credit
- Recorded action
No action description supplied.
- Authored result summary
General cover-time theory certifies the interval, and the exact connected-set recurrence reduces the finite computation to 116,166 systems.
- Reported outcome
No separate outcome supplied.
- Recorded status
in_progress
- Recorded evidence grade
sourced
- Recorded scope
Read complete recorded scope
{ "kind": "bounded", "statement": "connected visited sets and starting symmetry orbits for simple random walk on P_4 square P_5", "bounds": { "rows": { "min": 4, "max": 4 }, "columns": { "min": 5, "max": 5 }, "connected_nonempty_subsets": { "min": 116166, "max": 116166 } }, "exhaustive": true }
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2Authored explanation
Matthews proves the harmonic-factor comparison between cover time and maximal hitting time. Chandra, Raghavan, Ruzzo, Smolensky, and Tiwari relate commute time to electrical resistance. On this grid, a shortest path gives an immediate resistance upper bound of 7.
The finite-state audit enumerated 116,166 connected nonempty subsets. Reflection in the horizontal and vertical axes gives six starting orbits. Exact rational elimination over every connected-set Dirichlet system was started and exceeded the allotted entry time. No exact value or maximizing orbit is claimed here.
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3Outcome
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Verification source: doi.org ↗, Peter Matthews, Covering problems for Markov chains, Annals of Probability 16 (1988), 1215-1228; A. Chandra et al., The electrical resistance of a graph captures its commute and cover times, STOC 1989, 574-586
4What was measured
5How it connects
Informs
- claim
Recorded for
- problem
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}7Provenance
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