Fernández Pérez, Luis AntonioMuñoz Sudupe, AntonioRuiz Lorenzo, J. J.Tarancón, A.2023-06-202023-06-201995-040920-5632https://hdl.handle.net/20.500.14352/60106© 1995 Elsevier Science B.V. International Symposium on Lattice Field Theory (LATTICE 94) (12. 1994. Bielefeld, Germany). We acknowledge CICyT for partial financial support with the projects AEN93-0604, AEN93-0776 and AEN94-218. One of us (JJRL) is granted by MEC (Spain).We propose a family of renormalization group transformations characterized by free parameters that may be tuned in order to reduce the truncation effects. As a check we test them in the three dimensional XY model. The Schwinger-Dyson equations are used to study the renormalization group flow.engjournal articlehttp://dx.doi.org/10.1016/0920-5632(95)00386-nhttp://www.sciencedirect.comopen access5351-73Lattice.Física (Física)Física-Modelos matemáticos22 Física