Shuhan diagram is an interdisciplinary research object of graph theory, Kac-Moody algebra and matrix theory. Firstly, Shuhan diagram is defined, and then using the classification method of graph theory, all connected Shuhan diagrams: A(a)n(n≥2), D(a)n(n≥4), E(a)6, E(a)7, E(a)8 are obtained, this proves that Dynkin diagram corresponding to the connected non twisted single-side affine Lie algebra is exactly all connected Shuhan diagram with the minimum number of 1. Furthermore, according to the properties of Shuhan diagrams, any Shuhan diagram is composed of several connected Shuhan diagrams, which gives a complete classification of Shuhan diagrams. |