LaTeX.org

Hi:

If I type $W_{\mathbb C}$, the subscript is too big.

If I type $W_{\tiny {\C}}$, I get a TEX warning (\tiny is not allowed
in math mode), but the actual page looks exactly as I want.

And if I try to use a macro, say, like that

\newcommand{\lc}{\tiny {\C}}

I even get an error message saying ...