Sorry, this may be very easy question but I didn't get. When I use product symbol, I want to write c(as a cardinal product) in the lower suffix. I am using following command.

\documentclass{12 pt}{article}


$\prod_{i = 1}^{n}_{c} A_{i}$


I’m not sure want exactkly you like to get but you can inlcude the _c part inside the braces of n:

\prod_{i = 1}^{n_c} A_{i}

which will give

enter image description here

Pleas note that the first argument of \documentclass is optional and for that needy square brackets, and the font size option is without a space, i.e. 12pt instead of 12 pt

  • Thank you very much Tobi. Actually, I need c in the lower suffix of product. Like \prod_{c}, where c represent the symbol of cardinal product. – Rajesh Aug 12 '13 at 22:31
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    Then it's \mathop{\prod_c}\limits_{i=1}^n – kahen Aug 12 '13 at 22:33
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    @kahen: Why don’t you extend your comment and write an answer (e.g. explaining why the \mathop is necessary …) – Tobi Aug 12 '13 at 23:37

Can you be more specific about what you want the "c" to be a suffix of? Would either

${\prod_{i = 1}^{n}}_{c} A_{i}$


${\prod_c}^n_{i = 1} A_{i}$


Also, your first line of code should be: \documentclass[12 pt]{article}.

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