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Near-integrability of 2+1-dimensional Yang-Mills theories

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In an anisotropic limit of the weakly-coupled, 2+1-dimensional non-Abelian
gauge theories are equivalent to a collection of integrable
1+1-dimensional quantum field theories. This fact makes it possible to
understand confinement near this limit. Using exact form factors, it is
possible to study the theory away from the extreme anisotropic limit. The
string tension between fundamental color sources is found. Adjoint sources
are not confined. Some ideas concerning the isotropic case and the
generalization to 3+1 dimensions will be discussed.