%% This is a LaTeX document.  Hey, Emacs, -*- latex -*- , get it?
\documentclass[10pt]{article}
\usepackage[english]{babel}
\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
%
\pdfmapline{biproduct biproduct <biproduct.pfb}
\DeclareFontFamily{U}{biproduct}{}
\DeclareFontShape{U}{biproduct}{m}{n}{<->biproduct}{}
\DeclareSymbolFont{biproduct}{U}{biproduct}{m}{n}
\DeclareMathSymbol{\biprod}{\mathop}{biproduct}{"40}
%
\pagestyle{empty}
\begin{document}
\[
\biprod_{v\in\Omega} X(k_v) =
\left\{
(P_v)\in \prod_{v\in\Omega} X(k_v)
:
(\exists S\subset\Omega\textrm{ finite})
(\forall v\not\in S) P_v \in X(\mathcal{O}_v)
\right\}
\]
\end{document}
