Math & Science ⇒ Vertical Space in Math Mode

[lo2]

I am trying to build the following:

Code: Select all

\documentclass[danish]{article}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage{geometry}
\usepackage{babel}
\usepackage{ae}
\usepackage{fancyhdr}
\usepackage[pdftex]{graphicx}
\geometry{verbose,letterpaper,bmargin=2cm,tmargin=2cm}
\pagestyle{fancy}
\title{Blækregning}
\author{Name - bnc776}
\fancyhead[LE,RO]{side \thepage  $\ $/ \pageref{LastPage} -- \LaTeX}
\chead{}
\lhead{Name}
\begin{document}
\newcommand{\vetar}[4]{\left ( \begin{array}{cc} #1 & #3 \\ #2 & #4  \end{array} \right ) }
\newcommand{\vecar}[2]{\left ( \begin{array}{c} #1 \\ #2 \end{array} \right ) }
\newcommand{\vedar}[3]{\left ( \begin{array}{c} #1 \\ #2 \\ #3 \end{array} \right ) }
\section{Lynopgave}
\tableofcontents{} 
\subsection{1.1}
Vi har de to flg. grafer, for funktionerne:
\[
f_1(x)=\frac{x^2-7}{x+\sqrt{7}} \vspace(12 pt) \mathrm{og} \vspace(12 pt) f_2(x)=\frac{x^2-7}{x+2.645751311}
\]
\end{document}

The errors I get are these:

Code: Select all

Missing number, treated as zero f_1(x)=\frac{x^2-7}{x+\sqrt{7}} \vspace(
Illegal unit of measure (pt inserted) f_1(x)=\frac{x^2-7}{x+\sqrt{7}} \vspace(
Missing number, treated as zero ...rt{7}} \vspace(12 pt) \mathrm{og} \vspace(
Illegal unit of measure (pt inserted) ...rt{7}} \vspace(12 pt) \mathrm{og} \vspace(
 \fancyhead's `E' option without twoside option is useless on input line 13. \fancyhead's `E' option without twoside option is useless
 Reference `LastPage' on page 1 undefined on input line 27.
 There were undefined references.

[cgnieder]

\vspace's argument is no different than most other arguments: it's enclosed by braces:

Code: Select all

\vspace{12pt}

This won't give you the result you're hoping for, though. You might want to use one of amsmath's aligning environments together with its command \intertext:

Code: Select all

\documentclass[danish]{article}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage{geometry}
\usepackage{babel}
\usepackage{amsmath}
\begin{document}


\begin{align*}
 f_1(x) &= \frac{x^2-7}{x+\sqrt{7}}
 \intertext{og} \\
 f_2(x) &= \frac{x^2-7}{x+2.645751311}
\end{align*}
\end{document}

Regards

[lo2]

\vspace's argument is no different than most other arguments: it's enclosed by braces:

Code: Select all

\vspace{12pt}

This won't give you the result you're hoping for, though. You might want to use one of amsmath's aligning environments together with its command \intertext:

Code: Select all

\documentclass[danish]{article}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage{geometry}
\usepackage{babel}
\usepackage{amsmath}
\begin{document}


\begin{align*}
 f_1(x) &= \frac{x^2-7}{x+\sqrt{7}}
 \intertext{og} \\
 f_2(x) &= \frac{x^2-7}{x+2.645751311}
\end{align*}
\end{document}

Regards

Ok so this structure cannot be obtained by using the \[ and \] method??

[cgnieder]

Well, one you do some hacking but that would not be what \[ and \] are meant for.

It is generally advised and agreed by many LaTeX users that every document doing serious maths should use amsmath.

There are some good manuals about mathmode and amsmath's features:

• mathmode - generally about math mode
• amsmath - the amsmath manual
• mathtools - the mathtools manual; mathtools offers some improvements on amsmath (and of course loads it itself!)

Regards