Engineering↗
Extension and Torsion Functors with Group Cohomology
Handbook guide to extension and torsion functors with group cohomology, covering definitions, key results, methods, verification checks and worked examples.
Tag
torsion
Every page in the KEVOS library tagged torsion. 3 pages.
Engineering↗
Computing Ext Groups
Techniques for computing Ext: choice of variable, use of the long exact sequences, standard computations over the integers, and Ext for cyclic and finitely generated modules.
Engineering↗
The Tor Functor
Tor defined by projective resolutions, symmetry in its two variables, vanishing criteria, and the standard computations over the integers.
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