Capitulation des $2$-classes d'idéaux de type $(2, 4)$

Abstract: In this paper, we establish two main results which give conditions necessary and sufficient for a $ 2 $-group metabelian such that $G/G'$ is of type $(2, 4)$ either metacyclic or not. If $G$ is the Galois group of $\mathbf{k}_2^{(2)}/\mathbf{k}$ where $\mathbf{k}_2^{(2)}$ is the the Second Hilbert $2$-class field of a number field $\mathbf{k}$, we will get results on the problem of capitulation.