Styles
Alternate letterforms within formulas.
These functions are distinct from the text function because math fonts
contain multiple variants of each letter.
Calculation
upright
Upright (non-italic) font style in math.
$ upright(A) != A $
body
The content to style.
italic
Italic font style in math.
For roman letters and greek lowercase letters, this is already the default.
body
The content to style.
bold
Bold font style in math.
$ bold(A) := B^+ $
body
The content to style.