With the request of geometry modeling system and application of the concept about complexes algebraictopology in the field of industrial production , the theory of non-manifold model come into being.
According to Einstein's general theory of relativity, space and time together form a space-time continuum, or manifold which has not flat but curved by the matter and energy in it.
Good biographies of some of the greatest mathematical minds are rare: because they were polymaths, biographers who can interpret their manifold achievements for the ordinary mortal are themselves thin on the ground.