Aldrovandi, R.Stédile, E.2022-04-292022-04-291984-04-01International Journal of Theoretical Physics, v. 23, n. 4, p. 301-323, 1984.0020-77481572-9575http://hdl.handle.net/11449/230942Gauge theories for nonsemisimple groups are examined. A theory for the Poincaré group with all the essential characteristics of a Yang-Mills theory necessarily possesses extra equations. Inonü-Wigner contractions of gauge theories are introduced which provide a Lagrangian formalism, equivalent to a Lagrangian de Sitter theory supplemented by weak constraints. © 1984 Plenum Publishing Corporation.301-323engArtigo10.1007/BF021145112-s2.0-0040418410