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In Latex, I always use \mathbb{something0}_{something1}^{something2}, wheres sometimes 'something1' or 'something2' can be empty. So I had the idea to create a newcommand using the \newcommand. So I tried a lot. I wanna know if is possible to create a command such that if I use \mb{R} it's print \mathbb{R}; if I use \mb[+]{R} it's print \mathbb{R}_{+}; if I use \mb[n][+]{R} it's print \mathbb{R}_{+}^{n}. Or a newcommand that do something like that.

This is one of my attempts:

\newcommand{\mb}[3][ ]{\mathbb{#3}_{#2}^{#1}}

but when I try \mb[n][+]{R} the command only print \mathbb{R}^b+.

Thanks

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This may help you:

More than one optional argument for newcommand

For your specific example though, I usually just do the following:

\newcommand{\R}{\mathbb{R}}

And then I write

\R
\R_+
\R_+^n

I find that much more easily readable.

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