Elizalde, E. (Emili), 1950-2012-04-262012-04-2619780022-2488https://hdl.handle.net/2445/24502Through an imaginary change of coordinates, the ordinary Poincar algebra is shown to be a subalgebra of the Galilei one in four space dimensions. Through a subsequent contraction the remaining Lie generators are eliminated in a natural way. An application of these results to connect Galilean and relativistic field equations is discussed.3 p.application/pdfeng(c) American Institute of Physics, 1978Teoria de camps (Física)Spin (Física nuclear)Àlgebres de LieField theory (Physics)Nucler spinLie algebrasinfo:eu-repo/semantics/article131info:eu-repo/semantics/openAccess