331 model - meaning and definition. What is 331 model
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What (who) is 331 model - definition


331 model         
The 331 model in particle physics is an extension of the electroweak gauge symmetry which offers an explanation of why there must be three families of quarks and leptons. The name "331" comes from the full gauge symmetry group SU(3)_C \times SU(3)_L \times U(1)_X\,.
Model act         
SUGGESTED EXAMPLE FOR HOW TO WRITE A LAW WELL
Model Act; Model law; Model legislation; Model statute; Model Law; Model laws; Model acts; Model bill; Model bills; Model Procurement Code for State and Local Governments
A model act, also called a model law or a piece of model legislation, is a suggested example for a law, drafted centrally to be disseminated and suggested for enactment in multiple independent legislatures. The motivation classically has been the hope of fostering more legal uniformity among jurisdictions, and better practice in legislative wording, than would otherwise occur; another motivation sometimes has been lobbying disguised under such ideals.
German submarine U-331         
  • HMS ''Barham''{{'}}s main magazines explode, 25 November 1941
GERMAN TYPE VII C WORLD WAR II SUBMARINE
U-331; Unterseeboot 331; German submarine U 331; German submarine U331; U 331; U331
German submarine U-331 was a Type VIIC U-boat of Nazi Germany's Kriegsmarine during World War II, famous for sinking the battleship HMS Barham.