=ADD= =reftype= 14 =number= 02-03 =url= ftp://ftp.risc.uni-linz.ac.at/pub/techreports/2002/02-03.ps.gz =year= 2002 =month= 07 =author= Schneider; Carsten =title= Solving Parameterized Linear Difference Equations in $\Pi\Sigma$-Fields =abstract= In this work algorithms are developed that enable to find all solutions of parameterized linear difference equations in a very general difference field setting, so called $\Pi\Sigma$-fields. These algorithms not only empower to simplify indefinite nested multisums, but also allow to proof and discover a huge class of definite multisums identities. =sponsor= Supported by SFB grant F1305 of the Austrian FWF. =keywords= parameterized linear difference equations, $\Pi\Sigma$-fields