%0 Journal Article %T Difference and Difference Quotient. Part III %A Xiquan Liang %A Ling Tang %J Formalized Mathematics %@ 1898-9934 %D 2010 %I %R 10.2478/v10037-010-0008-8 %X In this article, we give some important theorems of forward difference, backward difference, central difference and difference quotient and forward difference, backward difference, central difference and difference quotient formulas of some special functions. %U http://versita.metapress.com/content/y402321328925160/?p=61b23553b62540b9a78312c2f3ea4bb9&pi=7