We compute almost-complex invariants $h^{ p,0}_{ \overline\partial}$, $h^{ p,0}_{ \text{ Dol}}$ and almost-Hermitian invariants $h^{ p,0}_{ \bar\delta}$ on families of almost-K\"ahler and almost-Hermitian $6$-dimensional solvmanifolds. Finally, as a consequence of almost-K\"ahler identities we provide an obstruction to the existence of a symplectic structure on a given compact almost-complex manifold. Notice that, when $(X,J,g,\omega)$ is a compact almost Hermitian manifold of real dimension greater than four, not much is known concerning the numbers $h^{ p,q}_{ \overline\partial}$.
Categories: math.DG