Let R be a prime ring with maximal right ring of quotients Qmr ,C is the center of Qmr δ1,δ2,δ3are derivations of R.If l1δ1+l2δ2+l3δ3,li≠0,i=1,2,3 is still a derivation of Rang the expression [l1δ1(x)+l2δ2(x)+l3δ3(x),x]=0,x∈R is satisfied , then their spe
DerivationPrime ringMaximal right ring of quentientsExtended eentriod