Given a finite dimensional special biserial algebra A with normed basis we obtain the dimension formulae of the first Ho......

The distributivity of the forgetful functor F and of certain subfunctors of F has been studied....

一、引言早在1938年,布尔曼(Bulman)就论述了双笔石类的起源,至今已有55年的历史。在这半个多世纪里,先后又有不少笔石学者论述这......