In the 1920s, when quantum mechanics was in its infancy, chemists and solid state physicists had little choice but to manipulate unwieldy equations to determine the properties of even the simplest molecules. When mathematicians turned their attention to the equations of quantum mechanics, they discovered that these could be expressed in terms of gr
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"Throughout, I have had in mind the experimentalist who wishes to grasp the principles of the theory (of continuous groups) and learn how to apply them to physical problems."-From the introduction
