•We have discussed the definitions and properties of the SDFS's as a
generalized system of " number, coherent, squeezed coherent,
squeezed number and displaced Fock " states. The matrix elements and the
inner product of two different SDFS's have been considered. The so-called
squeezed-state excitations have been reviewed. The superposition of SDFS's are
considered in two different states, a
pair of SDFS's and four-component
superposition. The definitions
and properties of these states have been introduced.
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