(Excerpt from "The MathML Handbook" by Pavi Sandhu)
The mn element is used to represent a numeric literal; that is, a string that represents a number. A numeric literal can consist of an optional "+" or "-" sign followed by an arbitrary number of digits, possibly separated by a decimal point. The number can be in any base and any standard notation. The contents of the mn element are typically displayed in an upright font.
Numbers that have some structure (such as negative numbers, complex numbers, fractions, and symbolic constants) cannot be specified as simple mn elements and require additional presentation elements.
The mn element accepts the nine attributes common to all token elements.
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