What does it mean when a Lie Bracket has a subscript + or - directly after it?(adsbygoogle = window.adsbygoogle || []).push({});

I found this notation in http://en.wikipedia.org/wiki/Special_unitary_group" [Broken] under the fundamental representation heading

Those are Lie Brackets, right? I know Lie Brackets are being used elsewhere in the article.

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# Question about Lie Brackets in Group Theory

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