[Merged by Bors] - feat(Combinatorics/SimpleGraph/Basic): decidability instance for fromRel.Adj

[Paul-Lez]

This might be better as a definition - I'll let the reviewers weigh in on this.

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[github-actions]

PR summary 9196e9f909

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

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Declarations diff

+ instance {V : Type u} [DecidableEq V] (r : V → V → Prop)

You can run this locally as follows

## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>

The doc-module for script/declarations_diff.sh contains some details about this script.

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No changes to technical debt.

You can run this locally as

./scripts/technical-debt-metrics.sh pr_summary

• The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
• The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).

[YaelDillies]

I think this is plenty reasonable, thanks!

maintainer delegate

[github-actions]

🚀 Pull request has been placed on the maintainer queue by YaelDillies.

[urkud]

Thanks! 🎉
bors merge

[mathlib-bors]

Pull request successfully merged into master.

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