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Department of Mathematics, East China Normal University, Shanghai 200062, China 2. School of Science, Nanjing University of Science and Technology, Nanjing 210014, China
This paper introduced the concept of a local AT-algebra and proved that a C*- algebra is a local AT-algebra if and only if it is an AT-algebra. Properties of AT-algebra conerning their semigroups formed by the equivalence classes of projections were studied.