The geometric structure of Friedmann universe in the discrete spacetime and its properties
离散时空的Friedmann宇宙的几何结构及其性质

The geometric structure of Friedmann universe in the discrete space time is researched. It is proved that the dust matter which forms the Friedmann universe is not distributed on the Friedmann spacetime points. The geodesic motion equations of test particles are derived, and the effects of clock and frequency shift are revealed.