  In the first part we analyze space $\mathcal G^*(\mathbb R^{n}_+)$ and its
dual through Laguerre expansions when these spaces correspond to a general
sequence $\{M_p\}_{p\in\mathbb N_0}$, where $^*$ is a common notation for the
Beurling and Roumieu cases of spaces. In the second part we are solving
equation of the form $Lu=f,\; L=\sum_{j=1}^ka_jA_j^{h_j}+cE^{d}_y+bP(x,D_x),$
where $f$ belongs to the tensor product of ultradistribution spaces over
compact manifolds without boundaries as well as ultradistribution spaces on
$\mathbb R^n_+$ and $\mathbb R^m$; $A_j, j=1,...,k$, $E_y$ and $P(x,D_x)$ are
operators whose eigenfunctions form orthonormal basis of corresponding
$L^2-$space. The sequence space representation of solutions enable us to study
the solvability and the hypoellipticity in the specified spaces of
ultradistributions.
