A Note on Six-Dimensional Gauge Theories

We study the new ``gauge'' theories in 5+1 dimensions, and their non-commutative generalizations. We argue that the $θ$-term and the non-commutative torus parameters appear on an equal footing in the non-critical string theories which define the gauge theories. The use of these theories as a Matrix description of M-theory on $T^5$, as well as a closely related realization as 5-branes in type IIB string theory, proves useful in studying some of their properties.

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