feat(SimpleGraph): strongly regular graphs have diameter 2#35655
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Rida-Hamadani wants to merge 5 commits intoleanprover-community:masterfrom
Open
feat(SimpleGraph): strongly regular graphs have diameter 2#35655Rida-Hamadani wants to merge 5 commits intoleanprover-community:masterfrom
Rida-Hamadani wants to merge 5 commits intoleanprover-community:masterfrom
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PR summary 68e18bf8ed
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| File | Base Count | Head Count | Change |
|---|---|---|---|
| Mathlib.Combinatorics.SimpleGraph.StronglyRegular | 1126 | 1131 | +5 (+0.44%) |
Import changes for all files
| Files | Import difference |
|---|---|
Mathlib.Combinatorics.SimpleGraph.StronglyRegular |
5 |
Declarations diff
+ IsSRGWith.ediam_eq_two
You can run this locally as follows
## summary with just the declaration names:
./scripts/pr_summary/declarations_diff.sh <optional_commit>
## more verbose report:
./scripts/pr_summary/declarations_diff.sh long <optional_commit>The doc-module for scripts/pr_summary/declarations_diff.sh contains some details about this script.
No changes to technical debt.
You can run this locally as
./scripts/reporting/technical-debt-metrics.sh pr_summary
- The
relativevalue is the weighted sum of the differences with weight given by the inverse of the current value of the statistic. - The
absolutevalue is therelativevalue divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).
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A strongly regular graph with positive
μmust have diameter 2, as long as the vertex set is nontrivial and it is not complete.This statement is useful in the literature, I wanted to add it after seeing it being used in the proof of the Hoffman-Singleton theorem.