The aim of the book Harmonic Analysis and Approximation on the Unit Sphereis:(1)to give a basic introduxtion to the spherical harmonic expansion i.e.the Fourier-Laplace series of functions on the sphe
Introduction、The Landau-Ginzburg Hamiltonian、Saddle point approximation, and mean-field theory、Continuous symmetry breaking and Goldstone modes、Discrete symmetry breaking and domain walls、Fluctuations
