GF functions

Detailed Description

Physical operations acting on Green's functions.

This is a parent group for operations frequently applied to Green's functions: computing the particle density (GF density), fitting and manipulating high-frequency tails (GF tail fitting), checking reality and hermiticity (GF reality and hermiticity) and converting between basis representations (GF basis conversions).

Topics
	GF basis conversions
	Conversions between basis representations of a Green's function.
	GF density
	Computation of the particle density from a Green's function.
	GF reality and hermiticity
	Reality and hermiticity checks and operations on Green's functions.
	GF tail fitting
	Fitting and manipulation of the high-frequency tail of a Green's function.