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44 lines
1.2 KiB
ReStructuredText
.. highlight:: c
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.. _intro:
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Introduction
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=================
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The TRIQS library provides a generic container `gf` and its view `gf_view`, to store and manipulate
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various Green functions.
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Several specific green functions are implemented :
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* real time(s),
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* real frequency(ies),
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* Matsubara time(s),
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* Matsubara frequency(ies),
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* Legendre representation.
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* Block of other green functions.
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* Cartesian product of green functions.
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Various free functions are also provided to handle transformations between various representation of a Green function,
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such as Fourier transforms.
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More generally, the variable is a point of a ``domain``
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The value of the Green function on a point of the domain can be a scalar, a matrix or whatever you want (this type is called type ``target_t``).
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You can group several green functions into *blocks* (for example, one block per orbital, or per wave vector...).
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Fourier transforms are implemented for these Green functions:
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real time <-> real frequency
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Matsubara time <-> Matsubara frequency
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This section is organized as follows :
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* the concepts related to Green functions, their domain, their representation on a grid.
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* the container `gf` and its view `gf_view`, which represent various Green functions.
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