The Mathematical and Computational Sciences at Western are represented by four separate departments: Applied Mathematics, Computer Science, Mathematics, and Statistical & Actuarial Sciences. The Department of Mathematics has established research groups in several areas of contemporary mathematics including algebra, analysis and analytic geometry, homotopy theory, and noncommutative geometry.

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Let $p>2$ be a prime number and $K$ be a number field. Let $S$ be a finite set of primes of $K$ and let $K_S$ be the maximal pro-$p$ extension of $K$ unramified outside $S$; put $G_S=$ Gal $({K_S}{K})$. If $S$ contains the primes above $p$, we know that $cd(G_S)$ less than or equal to $2$, but what is going on if this is not the case?
Thanks to a criteria of Labute, Mináč and Schmidt, we can exhibit mild pro-$p$ groups $G_S$ (and then of cohomological dimension $2$). In this talk I will explain the question of the propagation of the mildness property along some quadratic extensions of $\mathbb{Q}$. In particular, I will give some statistics and some theorical results.