文档介绍：arXiv:hep-th/9803131 v2 7 Apr 1998
Marc
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1. Introduction
Understanding the large N behavior of gauge theories in four dimensions is a classic
and important problem [1]. The structure of the “planar diagrams” that dominate the
large N limit gave the first clue that this problem might be solved by interpreting four-
dimensional large N gauge theory as a string theory. Attempts in this direction have
led to many insights relevant to critical string theory; for an account of the status, see
[2]. Recently, motivated by studies of interactions of branes