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Xavier Andrade edited Sternheimer.tex
over 9 years ago
Commit id: fbeee1df809ae70ab2c216ce70401ada46d0601f
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In textbooks, perturbation theory is formulated in terms of sums over
states and response functions. These are useful theoretical
constructions that permit a good description and understanding of the
underlying physics. However, this is not always a good
description starting point for
numerical applications, since it involves the calculation of a large
number of eigenvectors, infinite sums over these eigenvectors, and functions that depend on two or more spatial variables.