Free product of left quasi-normal bands
BI Xiao-dong · Journal of Shandong University · 2008
It is proved that the maximal left quasinormal band homomorphic image of the free product of right quasi-normal bands in the semi-group categrory is isomorphic to their free product in the left quasi-normal band category.Then,the existence of the free product in left quasinormal band was proved.Finally,the concept of commutative free product was given,and the relationship between semi-lattice free product and commutative free product was examined.