
 Chiral Symmetry and the Isospin 
  The chiral symmetry is therefore broken in two ways: (i) explicitly, by the presence of a symmetry breaking term in the Lagrangian, and (ii) dynamically, as discussed above. 
  We have identified basic symmetry properties of the QCD solutions, and now we have to go to the next level of description, namely, consider composite objects built of quarks. 
  Instead, we consider the composite objects to be elementary, and we guess their properties from symmetry considerations of the lowerlevel fields; otherwise, it would have been too difficult a task. 
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