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The properties of (N X N)-matrix-valued-field theories, in the limit N goesto infinity, are harder to obtain than those for isovector-valued fieldtheories. This is because we know less about the sum of planar diagrams thanthe sum of bubble/linear diagrams. Combining the 1/N-expansion with the axiomsfor form factors, exact form factors can be found for the integrable fieldtheory of an SU(N)-valued field in 1+1 dimensions. These form factors can beused to find the vacuum expectation value of the product of two fieldoperators. We briefly mention how the results can be applied to 2+1 dimensionalgauge theories.

Exact Correlators in the 't Hooft Limit of the Principal Chiral Model