Quotient by sum of ideals #950
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Co-authored-by: Matthias Hutzler <matthias-hutzler@posteo.net>
MatthiasHu
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Nov 7, 2022
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This PR shows, that R/(I+J)=(R/I)/J for CommRings R with ideals I and J.
Also includes: The image of an ideal under a surjective homomorphism is and ideal.
Includes some refactoring: