# Math-Linux, ces 60 derniers jours

Site d’un étudiant valenciennois dédié à Linux et au mathématiques.

## dimanche 9 mai 2021

• A subgroup is normal if and only if it is the kernel of a homomorphism.
We are going tho show that the kernel of a group homomorphism is a normal subgroup. Next, we prove that every normal subgroup is the kernel of a group homomorphism. Kernel of a group homomorphism is a normal subgroup Let $\varphi: G \rightarrow H$ a group homomorphism and \$\operatornameker (...)