...Effects

From this point on, effects will only be discussed only in terms of the hydrogen atom, although they can be extended to other one-electron atoms.

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...simply

To achieve consistency and avoid confusion, all equations are written in Gaussian units.

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...energy,

The reader may notice that E=-K, as a natural consequence of the virial theorem of classical mechanics.

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...here

See Eisberg and Resnick, chapter 7, for a more thorough discussion.

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...done

See Bjorken and Drell chapter 4 for a thorough discussion of the transformation.

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...Effects

From this point on, effects will only be discussed only in terms of the hydrogen atom, although they can be extended to other one-electron atoms.

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...hydrogen

See Feynman, volume III, chapter 12 for a discussion of the calculation of the splittings.

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