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
Group Kernel, Module Kernel, RangeThis entry contributed by Margherita Barile
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Cite this as:
Weisstein, Eric W., with contributions by Margherita Barile. "Cokernel." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Cokernel.html