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Equivalence of domains for hyperbolic Hubbard-Stratonovich transformations
hyperbolic Hubbard-Stratonovich transformations math
2010/11/11
We settle a long standing issue concerning the traditional derivation of non-compact non-linear sigma models in the theory of disordered electron systems: the hyperbolic Hubbard-Stratonovich (HS) tran...
Transformations of ordinary differential equations via Darboux transformation technique
ordinary differential equations Darboux transformation technique
2010/11/1
A new approach for obtaining the transformations of solutions of nonlinear ordinary differential equations representable as the compatibility condition of the overdetermined linear systems is propose...