MA3204 - Homological Algebra


Examination arrangement

Examination arrangement: Oral examination
Grade: Letters

Evaluation Weighting Duration Grade deviation Examination aids
Oral examination 100/100 D

Course content

The course deals with homological algebra for abelian categories in general, and modules over a ring in particular.


First category theory is introduced, both in the setup of categories in general and abelian categories in particular, and some basic properties are discussed (functors, natural transformations, limits and colimits, in particular kernels, cokernels, pullbacks, pushouts).


The main part of the course focuses on the study of derived functors, in particular the derived functors Ext and Tor. To this end, the concepts of complexes, homotopy, homology, projective and injective resolutions are introduced and studied. The discussion of the first Ext also involves comparison to short exact sequences (Yoneda-Ext).


Finally triangulated, and in particular derived categories are introduced, and Ext is interpreted as morphism set in the derived category.

Learning outcome

1. Knowledge.

The student knows the fundamental concepts of categories and functors, and in particular of the Hom and tensor functors. The student can construct derived functors, and is familiar with the derived functors Ext and Tor. Further the student knows how the derived category is constructed, and how to interpret Ext in terms of this category.


2. Skills.

The student can read, discuss, and write arguments using categorical language.

Given a right (or left) exact functor between abelian categories with enough projectives (injectives), the student can construct the left (right) derived functors, and interpret what their values mean for the exactness of the original functor.

Learning methods and activities

Lectures. The lectures will be given in English if the course is attended by students who don't master a Scandinavian language.


The lecturer may give and discuss exercises (which are not obligatory but recommended) in order to practice the concepts introduced.

Further on evaluation

In the case that the student receives an F/Fail as a final grade after both ordinary and re-sit exam, then the student must retake the course in its entirety. Submitted work that counts towards the final grade will also have to be retaken. For more information about grading and evaluation, see «Teaching methods and activities».

Required previous knowledge

Participants should have some experience working with modules over rings, in particular know what a module and a homomorphism of modules is, and preferably what kernel, cokernel, and image of such a homomorphism are.


For instance this knowledge could have been obtained by participating in the course MA3201 Rings and Modules.

Course materials

Will be announced at the start of the course.

Credit reductions

Course code Reduction From To
MNFMA330 7.5
More on the course

Version: 1
Credits:  7.5 SP
Study level: Second degree level


Term no.: 1
Teaching semester:  AUTUMN 2021

Language of instruction: English, Norwegian

Location: Trondheim

Subject area(s)
  • Mathematics
Contact information
Course coordinator: Lecturer(s):

Department with academic responsibility
Department of Mathematical Sciences


Examination arrangement: Oral examination

Term Status code Evaluation Weighting Examination aids Date Time Examination system Room *
Autumn ORD Oral examination 100/100 D
Room Building Number of candidates
  • * The location (room) for a written examination is published 3 days before examination date. If more than one room is listed, you will find your room at Studentweb.

For more information regarding registration for examination and examination procedures, see "Innsida - Exams"

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