| __Application of Unitary Transformations in the Study of Phase Diagram of Strongly Correlated Many-Body Systems. (E. ...__ *(Site not responding. Last check: 2007-11-05)* |

| | In order to enhance the development in such type of studies we use a procedure that starts from the existence of a given phase (proved with another method, see for example[1]) in a given domain of the parameter space connected to a model Hamiltonian. |

| | The procedure is based on the well known fact that an arbitrary **unitary** **transformation** does not change the eigenvalues spectrum, so if a state is a ground-state of a given Hamiltonian (H), the **transformed** state will be the ground-state of the system described by the **transformed** Hamiltonian (H'). |

| | The **unitary** **transformations** used by us[1] connect a superconducting state to a ferromagnetic state, a spin-density wavw state to a charge-density wave state, a phase separation in charge to a phase separation in spin. |

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