  In this paper, we first show that the Einstein field equations for all
perfect-fluid FLRW cosmologies can be written as a planar dynamical system with
the equation of state parameter $w$ and cosmological constant $\Lambda$ as
parameters. An important equilibrium point of this dynamical system is the
origin which represents Minkowski spacetime. It is shown that the Einstein
field equations in a neigbourhood of this point are equivalent to a degenerate
Bogdanov-Takens normal form. This normal form admits a set of equilibrium
points that describes a set of solutions to the Einstein field equations that
have a constant rate of expansion, negative spatial curvature, zero
cosmological constant and dust.
