图的正交因子分解（英文）

　　This book mainly discusses the problems with the orthogonal factorizations in graphs，and is divided into five chapters .In Chapter 1，we give the basic terminologies，definitions and notations.In Chapter 2，we study 1-orthogonal factorizations in graphs.In graphs. In Chapter 3，we obtain some results on 2-orthogonal factorizations in graphs.In Chapter 4，we justify some theorems on randomly r-orthogonal factorizations in graphs.In Chapter 5，we investigate the problems with orthogonal factorizations of digraphs and get some results on orthogonal factorizations of digraphs. \nThis book is a useful reference for college students and graduate students. \n

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