A well-known example is weak Hopf algebra, which is introduced in [L2] for studying the non-invertible solution of Yang-Baxter Equation based on this class of bialgebras (in [L2] and [L6]).

• 在文献[L2]中，为了研究Yang-Baxter方程的非平凡解，作者引入了著名的弱Hopf代数的概念使得基于这一类双代数，能够给出Yang-Baxter方程的一个非平凡解。