%0 Journal Article %T Comparison theorems on fractional order difference equations %A J. Jagan %A G. V. S. R. Deekshitulu %J Proyecciones (Antofagasta) %D 2013 %I Universidad Cat¨®lica del Norte %X One of the most efficient methods of obtaining information on the behaviour of solutions of difference equations, even when they cannot be solved explicitly, is the comparison principle. In general, the comparison principle is concerned with estimating a function satisfying adifference inequality by the solution of the corresponding difference equation. In the present paper, we shall establish various forms ofthe principle for fractional order difference equations. %K Difference equation %K under function %K over function %K fractional order %U http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-09172013000100003