The cokernel of a group homomorphism 
of Abelian groups
(modules, or abstract
vector spaces) is the quotient group (quotient
module or quotient space, respectively) 
.
Cokernel
See also
Range, Group Kernel, Module KernelThis entry contributed by Margherita Barile
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Cite this as:
Barile, Margherita. "Cokernel." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/Cokernel.html