[Tex/LaTex] How to put text below some text in an equation

equations

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Please refer the attached image. I want to write \omega \in \mathbb{R} below sup as shown in the equation in the image. How should I do it?

Best Answer

For what you want:

Er=\sup_{\omega\in\mathbb{R}}||G(j\omega)-R(j\omega)||_\infty 

enter image description here

If you want to put arbitrary text (or anything) below some other text (or anything you want) generally you can use \underset{}{} and \mathop{} like this

%\usepackage{amsmath}
\underset{Under}{Normal}

or

\mathop{Normal}_{Under}

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