Index Exponent with LaTeX

Question

Please, how can i write

C i,j 

in LaTeX (i as an index and j an an exponent)?

I know just that:

C^j
C_i  

Answer 1

You can add a subscript and a superscript in sequence: $C_a^b$. If you need more than one character in a sub- or superscript, use braces. Thus, $C_{ab}$ produces a subscript ab, and $C_{a^b}$ produces a subscript a which itself has a superscript b.

\documentclass[12pt]{article}
\begin{document}
\[ C_a^b \quad C_{ab} \quad C_{a^b} \]
\end{document}

(I used a and b because the last example doesn't work very well with i and j in the default font).