Z-transform involving the unit step function

nu(n) \Leftrightarrow \frac{z}{{\left( {z - 1} \right)^2 }},\left| z \right| > 1

% MathType!MTEF!2!1!+-
% feaafaart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn
% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr
% 4rNCHbGeaGqiVCI8FfYJH8YrFfeuY-Hhbbf9v8qqaqFr0xc9pk0xbb
% a9q8WqFfeaY-biLkVcLq-JHqpepeea0-as0Fb9pgeaYRXxe9vr0-vr
% 0-vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaiaad6gacaWG1b
% Gaaiikaiaad6gacaGGPaGaeyi1HS9aaSaaaeaacaWG6baabaWaaeWa
% aeaacaWG6bGaeyOeI0IaaGymaaGaayjkaiaawMcaamaaCaaaleqaba
% GaaGOmaaaaaaGccaGGSaWaaqWaaeaacaWG6baacaGLhWUaayjcSdGa
% eyOpa4JaaGymaaaa!493B!

Pasting the above "text" into MathType 5.0 will enter the above equation and make it possible to edit, save, and use in applications such as MS Word.