The following type size commands, in order of increasing font size, are supported by LaTeX.
The default for \normalsize is 10-point, but it may differ for some Document Styles or their options. The actual size produced by these commands also depends on the Document Style and, in some styles, more than one of these size commands may produce the same actual size.
The new size takes effect immediately after the size command; if an entire paragraph or unit is set in a certain size, the size command should include the blank line or the \end{} which delimites the unit. (See Declarations.)
These commands cannot be used in math mode. However, part of a formula may be set in a different size by using an \mbox command containing the size command.
See also Typeface Styles,
LaTeX2e Font Selection
See also Math fonts and styles
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