Dynamic electron correlation energy accurate estimation method

This chapter begins with a discussion of how to include non-dynamical and dynamical electron correlation into the wave function using a variety of methods. Because the mathematics associated with correlation techniques can be extraordinarily opaque, the discussion is deliberately restricted for the most part to a qualitative level an exception is Section 7.4.1, where many details of perturbation theory are laid out - those wishing to dispense with those details can skip this subsection without missing too much. Practical issues associated with the employ of particular techniques are discussed subsequently. At the end of the chapter, some of the most modem recipes for accurately and efficiently estimating the exact correlation energy are described, and a particular case study is provided. 

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