Let and g be normal endomorphisms of a group G. (a) g is a normal endomorphism.

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Let ∫ and g be normal endomorphisms of a group G.
(a) ∫g is a normal endomorphism.
(b) H ⊲ G implies ∫(H) ⊲ G.
(c) If ∫ + g is an endomorphism, then it is normal.

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