1

I want to show in my article a mathematical equation to express following expression

for i=1 to n
Pi < qi

How can I write this expression as an equation of proper form in LaTeX ?

1

Your question can be interpreted in many ways. I am assuming, that you want the following:

\documentclass{article}

\begin{document}

\[
\forall i\in\{1,\ldots,n\} (P_i<q_i)
\]

\end{document}

enter image description here

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