Set v of ZG-generators for the submodule '

(-1+x)e_a

(-1+y)e_b

(1-x)e_b+(-x+y-xy²+y³)e_c

(-1-y)e_a+(y+xy+yx+x²y+yx²+x³y)e_c

The main table

Summary

How to use the table?