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Group theory: Birdtracks, Lie’s, and exceptional groups
This monograph offers a derivation of all classical and exceptional semisimple Lie algebras through a classification of “primitive invariants.” Using somewhat unconventional notation inspired by the Feynman diagrams of quantumfield theory, the invariant tensors are represented by diagrams; severe limits on what simple groups could possibly exist are deduced by requiring that irreducible representations be of integer dimension. The method provides the full Killing-Cartan list of all possible simple Lie algebras, but fails to prove the existence of F4, E6, E7 and E8.
Once you know how to answer such group-theoretical questions, you can answer many others. This monograph tells you how. Like the brain, it is divided into two halves: the plodding half and the interesting half.
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