Searches for pair production of supersymmetric particles in e(+)e(-) collis
ions at centre-of-mass energy of 183 GeV have been performed on DELPHI data
under the assumption that R-parity is not conserved. Only one R-parity vio
lating coupling of lambda type, which couples the sleptons to the leptons (
LL (E) over bar term), is considered to be dominant at a time. Since in mod
els with R-parity violation any supersymmetric particle can be the lightest
one, searches for charginos, neutralinos, sleptons and squarks have been p
erformed both for direct R-parity violating decays and for indirect cascade
decays. Morever, it is assumed that the strength of the R-parity violating
couplings is such that the lifetimes can be neglected. The present study o
f supersymmetric particle pair production is used to exclude domains of the
Minimal Supersymmetric Standard Model parameter space previously explored
under the assumption of R-parity conservation.