M(atrix) theory (also known as BFSS-Matrix theory) is a fundamental formulation of M-theory as a random matrix model. Matrix string theory is related to M(atrix) theory in the same sense that superstring theory is related to M-theory.
M(atrix) theory is written in terms of interacting zero-dimensional Dirichlet branes in infinite momentum frame. It was proposed by Banks, Fischler, Shenker, and Susskind in 1996. See also the discussion in M-theory.
Read more about this topic: Matrix String Theory
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