[Merged by Bors] - feat: first isomorphism theorem for rings #7536
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This matches the textbook version which does not assume surjectivity, and is also consistent with the Mathlib group theory version.
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Co-authored-by: Eric Wieser <wieser.eric@gmail.com>
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This matches the textbook version which does not assume surjectivity, and is also consistent with the Mathlib group theory version.
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This matches the textbook version which does not assume surjectivity, and is also consistent with the Mathlib group theory version.