[Merged by Bors] - feat(RingTheory/Spectrum/Prime): f : R →+* S is local if the induced map Spec S → Spec R is surjective

[mbkybky]

f : R →+* S is local if the induced map Spec S → Spec R is surjective.

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[github-actions]

PR summary a655f149bb

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

+ IsLocalHom.of_specComap_surjective

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).

[chrisflav]

Thanks! I'll let a maintainer decide if the unrelated import improvements in the Topology file should be done in a separate PR or not.

maintainer delegate?

[github-actions]

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

[riccardobrasca]

Thanks!

bors merge

[mathlib-bors]

Pull request successfully merged into master.

Build succeeded:

• CI Success