Math & Science ⇒ Having trouble with alignment in equation

[jb4t5]

Hello,
I'm teaching myself LaTeX so I can help the applied mathematics professor I work for typeset his work. I'm practicing using an older document and need to figure out how to get:

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\begin{equation}\label{e1.2}
\|f\|_{L^{\infty}(a, b; X)} = Ess Sup_{[a, b]} \|f(t)\|_{X}.
\end{equation}

to display where

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Ess Sup

is centered on the horizontal line, and

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[a, b]

below as if it were in the "\limits" subscripting environment.

I'm using WinEdt as my editor, and basically have every LaTeX package imaginable.

any help is greatly appreciated and will help another gain more knowledge of the fickle language we call LaTeX .

[gmedina]

Hi,

use the \DeclareMathOperator* command from amsmath:

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\documentclass{article}
\usepackage{amsmath}

\DeclareMathOperator*{\esup}{Ess\ Sup}

\begin{document}

\begin{equation}\label{e1.2}
  \esup\limits_{[a, b]}.
\end{equation}

\end{document}

[jb4t5]

is there a way to accomplish this without the use of a macro?
Also, the "Sup" is capitalized in the document I'm using and i've been instructed to reproduce this.

[jb4t5]

Hello,
So far I have gotten this to work in this manner:

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\begin{equation}\label{e1.2}
\|f\|_{L^{\infty}(a, b; X)} = \raisebox{-1.5ex}[0ex]{\stackrel{\displaystyle{Ess Sup}}{_{[a, b]}} \|f(t)\|_{X}.
\end{equation}

but if I recall correctly, this should only be used for scooting text up and down?
It compiles but says I'm missing a "$" if i can figure out what's missing, this will suffice.

[frabjous]

Why don't you want to declare a new operator? That's good practice in cases like this.

Anyway, \raisebox takes you out of math mode, so if you wanted to use it in an equation, you'd need to put yourself back into math mode on the inside...

\raisebox{height}{$...$}

You've also got a mismatched number of braces in your example, and it was unclear exactly what you were trying to do. Anyway, what about something like:

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\begin{equation}\label{e1.2}
    \|f\|_{L^{\infty}(a, b; X)} = \mathop{\mathrm{Ess\ Sup}}_{[a, b]} \|f(t)\|_{X}.
\end{equation}

[jb4t5]

@frabjous: THANKS!, your solution worked wonders, I'd never heard of "\mathop" before now.

sorry about the uneven bracketing, i typed it fast and missed one.

also, the professor I work for is very precise when it comes to how he wants his documents typset (he's set in his ways, being over 70 years old, lol)

[localghost]

If the problem is solved with that, please mark the topic accordingly as described in Section 3 of the Board Rules.


Best regards and welcome to the board
Thorsten