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