  Let ${\mathcal X}$ be a Riemannian $n$-dimensional smooth compact closed
manifold, $n\geq 2$, $E^i$ be smooth vector bundles over $\mathcal X$ and
$\{A^i,E^i\}$ be an elliptic differential complex of linear first order
operators. We consider the operator equations, induced by the Navier-Stokes
type equations associated with $\{A^i,E^i\}$ on the scale of anisotropic
H\"older spaces over the layer ${\mathcal X} \times [0,T]$ with finite time $T
> 0$. Using the properties of the differentials $A^i$ and parabolic operators
over this scale of spaces, we reduce the equations to a nonlinear Fredholm
operator equation of the form $(I+K) u = f$, where $K$ is a compact continuous
operator. It appears that the Fr\'echet derivative $(I+K)'$ is continuously
invertible at every point of each Banach space under the consideration and the
map $(I+K)$ is open and injective in the space.
