Projectives and Injectives

Part of the Graduate Texts in Mathematics book series (GTM, volume 242)

This chapter contains some basic tools and definitions of module theory: exact sequences, pullbacks and pushouts, projective and injective modules, and injective hulls, with applications to rings. Sections 5 and 6 may be skipped.


Exact Sequence Commutative Diagram Direct Summand Short Exact Sequence Left Ideal 
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© Springer Science+Business Media, LLC 2007

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