E. Summary

• All cosmological models are characterized by `test particles', which are galaxies that are distributed in a homogeneous and isotropic manner in accordance with the CP.

• Open Models are characterized by < 1, negative curvature (k = -1), hyperbolic geometry, a deceleration parameter q < 1/2, and infinite spatial extent (ignoring topology).

• Closed Models are characterized by > 1, positive curvature (k = 1), spherical geometry, a deceleration parameter q > 1/2 and finite spatial extent.

• Flat Models are characterized by = 1, flat geometry with no curvature (k = 0), infinite spatial extent, a deceleration parameter q = 1/2 and with an age corresponding to Age = H₀^-1, since the Hubble Constant is in-fact constant.