Restriction Theorems On Métiver Groups Associated to Joint Functional Calculus

In this article, we get the spectral solution $\mathcal{P}_{\mu}^{m}$ of operators $m(\mathcal{L}, -\Delta_\mathfrak{z})$, the joint functional calculus of the sub-Laplacian and Laplacian on the centre of Métivier group. Then, we give some group-analogues of the Thomas-Stein-type restriction theorem, asserting the mix-norm boundness of the restriction operators $\mathcal{P}_{\mu}^{m}$ for two classes of functions $m=(a^\alpha+b^\beta)^\gamma$ and $m=(1+a^\alpha+b^\beta)^\gamma$ with $\alpha, \beta>0, \gamma\neq0$.