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In category theory and its applications to other branches of mathematics, kernels are a generalization of the kernels of group homomorphisms, the kernels of module homomorphisms and certain other kernels from algebra. Intuitively, the kernel of the morphism f : X → Y is the "most general" morphism k : K → X that yields zero when composed with f.
Note that kernel pairs and difference kernels sometimes go by the name "kernel"; while related, these aren't quite the same thing and are not discussed in this article.
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