Definition:Short Exact Sequence of Modules

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Definition

A short exact sequence is an exact sequence of the form:

$\ds 0 \longrightarrow M_2 \stackrel {d_2} {\longrightarrow} M_3 \stackrel {d_3} {\longrightarrow} M_4 \longrightarrow 0$

Also see

Definition:Long Exact Sequence of Modules

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Definitions/Homological Algebra