digilib@itb.ac.id +62 812 2508 8800

The main theorem proved here is as follows: If A is a finite dimensional algebra over an algebraically closed field, CompAd is an affine subvariety of AN, and X part of CompAd is a point representing an almost projective complex X degree, there exists a canonical vector space embedding TX(CompAd)/TX(G . X) --> HomD(A-mod)(X degree ,X[1]degree) where G is the pertinent product of general linear groups acting on CompAd, TX(-) denotes tangent space at X.