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Differential manifold,space-time structure and its 4-dimensionalgeometric construction

XIAO Xue-lei(Department of Physics,Fuling Teachers College,Fuling 408003,China)  
Based on differential geometry and its fundamental concept——differential manifold,the space-time background is pointed out in this paper,its structure is analyzed and discussed further.At last,the space-time structure is expressed and explained by 4-dimensional geometric language again.
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