feat(RingTheory/Finiteness/Ideal): I is finitely generated if f(I) and I ∩ ker(f) are finitely generated

[mbkybky]

Let f : R →+* S be a surjective ring homomorphism, and let I be an ideal of R. If f(I) and I ∩ ker(f) are finitely generated ideals, then I is also finitely generated.

---

[github-actions]

PR summary 93dad5f6db

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

---

Declarations diff

+ fg_of_fg_map_of_fg_inf_ker_of_surjective

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 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).