# Large-$N$ factorization of single-trace operators

Does anyone know where I can find a pedagogical explanation of large-$$N$$ factorization in $$SU(N)$$ gauge theories or nonlinear $$O(N)$$ sigma models (in the latter case the trace corresponds to a dot product).

The reference I am using is Polyakov's gauge fields and strings. However, I find the explanation of large-N factorization there quite opaque.

• I would look at Coleman's lecture in his book "Aspects of Symmetry" or arxiv.org/abs/hep-th/0306133 Jan 4 '14 at 5:55