[Tex/LaTex] How to give some text an equation number

amsmathequationsmath-modespacing

I want to be able to write the following in LaTeX

    We make the further assumption that
\begin{equation} \label{eqn:assumption} There is a bounded linear operator
    $B:X\to X^*$ such that $B^*=B$ and the operator $JB$ is an extension of $T'(0)$\end{equation}

and get a nice output, in such a way that this whole chunk of text along with the math can be referenced later. Of course I can write text inside the equation environment using \text{}, but when I tried this the spacing was all wrong. Can anyone suggest a solution to this?

Best Answer

Use a minipage

\documentclass{article}
\usepackage{amsmath}
\begin{document}
  We make the further assumption that
  \begin{equation}\label{eqn:assumption}
    \begin{minipage}{0.9\textwidth}
    There is a bounded linear operator
    $B:X\to X^*$ such that $B^*=B$ and the operator $JB$ is an
    extension of $T'(0)$
    \end{minipage}
  \end{equation}
\end{document}

enter image description here

Related Solutions

[Tex/LaTex] How to input open intervals

You can use \left] and \right[ then the brackets are taken as delimiters (and also get resized accordantly to the content):

\(X = \left]-\frac{π}{2}, +\frac{π}{2}\right[\)

Result

[Tex/LaTex] Typesetting a pattern matching equation

Without an image of exactly how you want this typeset it is difficult to know for sure, but perhaps one of these is what you are looking for:

enter image description here

or perhaps:

enter image description here

\documentclass{book}
\usepackage{amsmath}
\newcommand{\fib}{\mathrm{fib}}

\begin{document}
\begin{align*}
    &\text{if }  x < 2 & \fib X &= 1 \\
    &\text{otherwise } & \fib X &= (\fib (X - 1)) + (\fib (X - 2))
\end{align*}
Another option is:
\begin{align*}
\fib X = \begin{cases}
    \text{if }  x < 2 & = 1 \\
    \text{otherwise } & = (\fib (X - 1)) + (\fib (X - 2))
\end{cases}
\end{align*}
\end{document}

Here is how you can modify the given MWE to obtain better spacing:

enter image description here

Notes:

@{} is used to eliminate the inter column spacing
I added {} before the = to get proper math spacing.
I replaced the $$ ... $$ with \[ ... \]. See Why is \[ ... \] preferable to $$ ... $$? for more details.
Changes as per egreg's suggestions:
1. \mathit{foreign}, \mathit{time\_of\_call} and \mathrm{head} for better appearance of the formulas.
2. Removed \, after \prodtime, and the other uses of \operatorname.

Code:

\documentclass{article}
\usepackage{amsmath}

\newcommand{\prodtime}{\operatorname{prodtime}}

\begin{document}
\[
\begin{array}{l l @{}l}
\prodtime V & X = Y                        &{}= 0 \\
\prodtime V & X = f(\ldots)                &{}= 0 \\
\prodtime V & p(X_1,\,\ldots,\,X_n)        &{}= \prodtime V\,(\operatorname{body} p) \\
\prodtime V & V = \,f(X_1,\,\ldots,\,X_n)  &{}= \prodtime V\,(\operatorname{body} f) \\
\prodtime V & X_0(X_1,\,\ldots,\,X_n)      &{}= \mathit{time\_of\_call} \\
\prodtime V & m(X_1,\,\ldots,\,X_n)        &{}= \mathit{time\_of\_call} \\
\prodtime V & \mathit{foreign}(\ldots)     &{}= 0 \\
\prodtime V & G_\mathrm{head},\,G_\mathrm{tail}
\end{array}
\]
\end{document}

Best Answer

Related Solutions

[Tex/LaTex] How to input open intervals

[Tex/LaTex] Typesetting a pattern matching equation

Notes:

Code:

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