Definition:Kernel


 * Abstract algebra:
 * Kernel of a homomorphism
 * Kernel of a group action


 * Analysis:
 * Kernel of an integral transform


 * Measure theory:
 * Kernel of a measurable space


 * Category theory:
 * Kernel of a morphism
 * Definition:Kernel in Additive Category

Also see

 * Definition:Cokernel