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By Mikhail Shifman. Author Mikhail Shifman. Phases of gauge theories; 2. Kinks and domain walls; 3. Vortices and flux tubes (strings); 4. Monopoles and Skyrmions; 5. Instantons; 6. Isotropic (anti)ferromagnet: O(3) sigma model and extensions, including CP(N-1); 7.
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