[Merged by Bors] - feat: port RingTheory.Congruence#1629
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ChrisHughes24 wants to merge 6 commits intomasterfrom
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[Merged by Bors] - feat: port RingTheory.Congruence#1629ChrisHughes24 wants to merge 6 commits intomasterfrom
ChrisHughes24 wants to merge 6 commits intomasterfrom
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…issue #1910 to refer to lean4 issue #1629 instead (#19381) These notes refer to the fact that `LinearMap.ker` and friends cannot be used as `f.ker`. However, this fails not because the function `LinearMap.ker` needs to be coerced to a proper function (which the issue leanprover/lean4#1910 is about), but because the argument `f` has a type (`LinearMap`) that doesn't occur directly as type of an argument to `LinearMap.ker`. The issue leanprover/lean4#1629 *does* suggest a fix for this.
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