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We consider three-dimensional SU(N) gauge theories with massless Dirac or Majorana fermions in the adjoint representation. We use the Eguchi-Kawai volume reduction to two-dimensions to calculate the tension σ k of the k-string in such theories. Under some assumptions whose validity we discuss, we derive the previously conjectured sine formula, σₖ~ Nsin ( π k/N ) .
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Armoni et al. (2011) studied this question.
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