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    STUDIA MATHEMATICA - Issue no. 1 / 2007  
         
  Article:   BOOK REVIEWS - JORGE IZE, ALFONSO VIGNOLI, EQUIVARIANT DEGREE THEORY.

Authors:  CSABA VARGA.
 
       
         
  Abstract:  In the last two decades many paper were dedicated to the study of the symmetry breaking for differential equations, Hopf bifurcation problems, periodic solutions of Hamiltonians systems. A very useful tool in the study of these problems is the equivariant degree theory. There are many equivalent methods to construct the degree theory, depending on the possible applications or on the particular taste of the user.  
         
     
         
         
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