The completion problems of partial inverse M-matrix for 3-chordal graph are discussed by using graph theory and the completion theorems for 3-chordal graphs are presented in this paper.

• 摘要利用图论的相关知识，在1-弦图、2-弦图完备的基础上探讨了3-弦图的完备问题，给出3-弦图的完备定理。