Latex multiply symbol
The x is done by \times. It must be used in mathmode: $3\times4$ $N\times N$.
In Math, the \cdot command can be used to represent the centered dot multiplication symbol as opposed to the conventional \times symbol and similar to \ldots.
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Integrals, sums and limits
Description:At any given point during the processing of a document, TeX is in one of those three modes. The behavior of TeX depends on the mode it's in. For example, certain characters like the underline or caret symbols are only allowed in a math mode, while others like the "greater than" symbol take on completely different meanings, depending on whether TeX is in text or in math mode. This is the normal, or default, mode of TeX. TeX stays in that mode unless it encounters a special instruction that causes it to switch to one of the math modes, and it returns to text mode following a corresponding instruction that indicates the end of math mode.