ACTA MATHEMATICA HUNGARICA, cilt.119, sa.3, ss.201-217, 2008 (SCI-Expanded)
We introduce the generalized fractional integrals (generalized B-fractional integrals) generated by the Delta(B) Laplace-Bessel differential operator and give some results for them. We obtain O'Neil type inequalities for the B-convolutions and give pointwise rearrangement estimates of the generalized B-fractional integrals. Then we get the L (p,gamma) -boundedness of the generalized B-convolution operator, the generalized B-Riesz potential and the generalized fractional B-maximal function. Finally, we prove a sharp pointwise estimate of the nonincreasing rearrangement of the generalized fractional B-maximal function.