A k-HAMILTON-NICE SEQUENCE
刘一平, 田丰, 吴正声 · Chinese Science Bulletin · 1992
Let G be an undirected simple graph, t be a positive integer. Write; Y is an independent set of G, |Y|=t}. For Y∈I_t(G), i∈{0, 0, …, t}, set S_i(Y):={v∈V(G); |N(v)∩Y|=i}, s_i(Y):=|S_i(Y)|. In 1990, Chen Guan-tao et al. introduced the following definition.