2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/126993We discussed quantum deformations of D=4 Lorentz and Poincare algebras. In the case of Poincare algebra it is shown that almost all classical r-matrices of S. Zakrzewski classification correspond to twisted deformations of Abelian and Jordanian types. A part of twists corresponding to the r-matrices of Zakrzewski classification are given in explicit form.10 pages. Invited talk at the XXII Max Born Symposium "Quantum, Super and Twistors", September 27-29, 2006, Wroclaw (Poland), in honour of Jerzy Lukierski.Quantum AlgebraHigh Energy Physics - TheoryMathematical PhysicsRepresentation Theory81R50 (Primary), 17B37 (Secondary)text