How do I change the font of a subformula?

How do I change the font of a subformula?

You can use one of the following font attributes:

• italic a typesets a in italic shape.
• so does ital a.
• nitalic a typesets a in upright shape (abbreviation for not italic).
• bold a typesets a in boldface.
• nbold a typesets a with normal weight (abbreviation for not bold).

In addition Math uses a set of three generic font families, which are used as follows:

• font serif a typesets a in a serifed font, usually Times.
• font sans a typesets a in a sans serif font, usually Helvetica or Arial.
• font fixed a typesets a in a fixed-width font, usually Courier.

Font attributes can be combined as in this example:

Enter bold font sans A to get A.

You can apply font attributes to an entire subformula if you group it with { } or other brackets. Example:

Enter a b bold {c d} e to typeset abcde.

When several font attributes are applied, the innermost takes precedence as shown in this example:

Enter bold {a b nbold c d} to get abcd.

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