The M5-brane is a type of extended object in string theory, specifically in the context of M-theory, which is an overarching framework that unifies various string theories. In M-theory, branes are multidimensional objects that can have different numbers of dimensions: - A D0-brane is a point-like object (0 dimensions). - A D1-brane is a string (1 dimension). - A D2-brane is a membrane (2 dimensions).
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