Unfortunately, the command `\Alpha`

does not produce capital version of `\alpha`

(as one might expect in analogy with how, say, `\Pi`

produces capital `\pi`

). It so happens that the capital alpha looks rather similar to `A`

, but that doesn't mean that there aren't situations where I would like to use capital alpha in a formula. For instance, suppose I already have `\pi`

which belongs to a set `\Pi`

, and then `\alpha`

comes along and I need a name for the set of its possible values.

What is the best way to write capital alpha?

The obvious first attempt is to just write `A`

. But it's not right – `A`

produces italic `A`

, while Greek letters are by default not italic. Would `\mathrm{A}`

do the trick, or is there some subtle issue I'm not noticing? Is there a package that will save me the work of defining all capital letters by hand?

## Best Answer

If you're using LuaLaTeX or XeLaTeX, you can use the

`unicode-math`

package. It defines all uppercase Greek letters:The result is:

This way has an advantage in that one can change the style of the letters by altering the

`unicode-math`

options. For example`\usepackage[math-style=ISO]{unicode-math}`

without any other changes yields:Also, this way alpha can be copied&pasted from the resulting PDF.