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Abstract

 In this paper، some elementary operations on triangular fuzzy numbers (TFNs) are defined. We also define some operations on triangular fuzzy matrices (TFMs) such as trace and triangular fuzzy determinant (TFD). Using elementary operations، some important properties of TFMs are presented. The concept of adjoints on TFM is discussed and some of their properties are. Some special types of TFMs (e.g. pure and fuzzy triangular، symmetric، pure and fuzzy skew-symmetric، singular، semi-singular، constant) are defined and a number of properties of these TFMs are presented