essential extension
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module
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mathematics
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International Standard Book Number
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digital object identifier
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ring
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ideal
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Zorn's lemma
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Springer Science+Business Media
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kernel
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Mathematical Reviews
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monomorphism
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epimorphism
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abelian category
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duality
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pullback
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David Eisenbud
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Nakayama lemma
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projective module
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Graduate Texts in Mathematics
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injective module
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