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Fields

This is the "first free comprehensive textbook on quantum (and classical) field theory. The approach is pragmatic, rather than traditional or artistic. It covers many recent topics at an introductory yet nontrivial level, such as supersymmetry, general relativity, supergravity, and strings. It introduces many topics not appearing in other textbooks, including: 1/N expansion (color ordering) in QCD, including relation to random worldsheets spacecone (spinor helicity), including explicit calculations of 4- and 5-point S-matrices in Yang-Mills many useful gauges, such as Gervais-Neveu, Nielsen-Kallosh, unitary lightcone, and even string gauges in gravity finite N=1 supersymmetric theories "

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