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Homological Algebra
This note covers the following topics: Reflections , Adjoint functors , Chain complexes, Homology , Homological algebra, First approximation to derived functors, Bar resolutions and the classical theory of derived functors, Double complexes, Long exact sequences, Diagrammatics , The third fundamental lemma, Generators and cogenerators.
Author(s): Mariusz Wodzicki
47 Pages 
Homological Algebra by Dietrich Burde
This note covers introduction, Rings and modules, Categories and functors, Resolutions and derived functors, Homology and cohomology of groups.
Author(s): Dietrich Burde
70 Pages
Homological Algebra Notes by Eloisa Grifo
This note explains categories for the working homological algebraist, The category of chain complexes, R Mod, Enough projectives and injectives, Resolutions, Derived functors, Abelian categories and spectral sequences.
Author(s): Eloisa Grifo
241 Pages