# How to print the “essential supremum” operator

I have problem with that:

How to do that? \supess don't exist, I tried with only {supess} but same - won't compile :/

This is what I have already: {supess}\limits_{0\leq x\leq 2\pi}.

• $\mathop{\mathrm{suppess}}\limits_{0\leq x\leq 2\pi}$ – user2478 Dec 27 '17 at 9:27
• @Herbert Or rather $\mathop{\mathrm{sup\,ess}}\limits_{0\leqslant x\leqslant 2\pi}$. However package polski (OP is a Pole) changes inequalities to the Polish version. – Przemysław Scherwentke Dec 27 '17 at 9:30
• Alternativity using the amsmath package: $\underset{0\leq x\leq 2\pi}{\mathrm{supess}}$ – leandriis Dec 27 '17 at 9:32
• @PrzemysławScherwentke: maybe, I have no idea what suppess means. – user2478 Dec 27 '17 at 10:34
• – Andrew Swann Dec 27 '17 at 11:52

I would use amsmath and \operatorname. While \mathrm uses normally the same font as the operators, one can be sure that this is true in all math setups. (The star leads to \limits):

\documentclass{article}
\usepackage{amsmath}
\begin{document}

$\operatorname*{sup~ess}_{0\leq x\leq 2\pi}$

\end{document}


Variants are to use sup\,ess, and the \leq can be changed too. If needed a command like \supess can be defined with \DeclareMathOperator.

You probably want to declare a new math operator:

\documentclass{article}
\usepackage{amsmath}

\DeclareMathOperator*{\supess}{sup\,ess}

\begin{document}

$\supess_{0\leq x\leq 2\pi}$

\end{document}


This is more convenient than using \operatorname*{sup\,ess} (note that ~ is not the best here), because you may be requested to change the rendering into

(a notation more commonly used in document written in English), which can be accomplished by just changing one line

\DeclareMathOperator*{\supess}{ess\,sup}


without chasing for all appearances in the document.

• What is the drawback of ~ in that setting? How do the two compare? – Clement C. Dec 27 '17 at 13:56
• @ClementC. The appearance is non-standard with the larger space between sup and ess. The thin space is preferred. – yo' Dec 27 '17 at 14:12

You can use the following:

\documentclass{article}

\begin{document}
$\mathop{\mathrm{sup~ess}}\limits_{0\leq x\leq 2\pi}$
\end{document}


with the result: