please let me know. please explain more basically and precisely..! thanks a lot
20 Let R be a commutative ring with 10 and V be a frec R-module with basis {v1,v2,...,vn}. aWhen n =2,show that A is nonzero in a direct way i.c.without using the determinant map). b)When n=3show that AA3 is nonzero in a direct way