Some Gr\"{u}ss type inequalities for $n$-tuples of vectors in semi-inner   modules
  Some Gr\"{u}ss type inequalities in semi-inner product modules over $C^*$-algebras and $H^*$-algebras for $n$-tuples of vectors are established. Also we give their natural applications for the approximation of the discrete Fourier and the Melin transforms in such modules. 
A.G.Ghazanfari and B.Ghazanfari
math.FA