It looks like there's only one paper in this tag, so it's history isn't too exciting,
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This paper reviews how two-index SU(N) gauge theories with fermions, including QCD, super Yang-Mills, and meson scattering theories, provide information about the large-N limit. Comparisons to recent lattice results estimate the size of 1/N^2 corrections. Analysis of meson scattering dynamics honors Weinberg's work on tetraquarks, which naturally appear in two-index the...