Aligned equation doesnt align properly

Question

Hi there. I try to simply align an equation but either way I try to do it, it doesnt look nice. In the first case there is no space behind the equal sign (clearly I can make some space there but I dont think this is the preferred way) and in the second case the 'p's are not aligned. What am I doing wrong? Thanks in advance for any help.

\documentclass[a4paper,10pt]{scrartcl}
\usepackage[utf8]{inputenc}
\usepackage{amsmath,commath}

\begin{document}
\begin{align*}
 &p((p-1)r_1^{p-2}r_2^{2q}(\overline{z}_1-z_1)^2+r_1^pr_2^{2q}-4\abs{z_{n+1}}^2(p-1)r_1^{p-2}r_2^{2q}+2r_1^{p-1}r_2^{2q}(z_1+\overline{z}_1))\\
 =&p(p-1)r_1^{p-2}r_2^{2q}((\overline{z}_1-z_1)^2-4\abs{z_{n+1}})
\end{align*}

\begin{align*}
 &\phantom{=}p((p-1)r_1^{p-2}r_2^{2q}(\overline{z}_1-z_1)^2+r_1^pr_2^{2q}-4\abs{z_{n+1}}^2(p-1)r_1^{p-2}r_2^{2q}+2r_1^{p-1}r_2^{2q}(z_1+\overline{z}_1))\\
 &=p(p-1)r_1^{p-2}r_2^{2q}((\overline{z}_1-z_1)^2-4\abs{z_{n+1}})
\end{align*}

\end{document}

score 1 · Accepted Answer · answered Oct 02 '18 at 15:24

1

Use one of these codes:

\documentclass[a4paper,10pt]{scrartcl}
\usepackage[utf8]{inputenc}
\usepackage{mathtools}%,commath
\DeclarePairedDelimiter{\abs}\lvert\rvert

\begin{document}

\begin{align*}
 &p((p-1)r_1^{p-2}r_2^{2q}(\overline{z}_1-z_1)^2+r_1^pr_2^{2q}-4\abs{z_{n+1}}^2(p-1)r_1^{p-2}r_2^{2q}+2r_1^{p-1}r_2^{2q}(z_1+\overline{z}_1))\\
={}&p(p-1)r_1^{p-2}r_2^{2q}((\overline{z}_1-z_1)^2-4\abs{z_{n+1}})
\end{align*}

\begin{align*}
 &\phantom{{}={}}p((p-1)r_1^{p-2}r_2^{2q}(\overline{z}_1-z_1)^2+r_1^pr_2^{2q}-4\abs{z_{n+1}}^2(p-1)r_1^{p-2}r_2^{2q}+2r_1^{p-1}r_2^{2q}(z_1+\overline{z}_1))\\
 &=p(p-1)r_1^{p-2}r_2^{2q}((\overline{z}_1-z_1)^2-4\abs{z_{n+1}})
\end{align*}

\end{document}

answered Oct 02 '18 at 15:24

Bernard

271,350

Thank you so much! This also saves the commath package I only used for abs. – Luke Mathwalker Oct 02 '18 at 16:12
Sadly I use the commath package for $\mathbb{1}$ also...:( – Luke Mathwalker Oct 02 '18 at 16:18
1

@LukeMathwalker I would beware loading the commath package at all (it does not define \mathbb though) – David Carlisle Oct 02 '18 at 16:25
@DavidCarlisle You are right! I use the $\norm$ command from commath. Can one express the norm like Bernard did? – Luke Mathwalker Oct 02 '18 at 16:34
1

@LukeMathwalker you mean with || instead of |? just use \lVert instead of lvert, the definitions in commath are mostly wrong unfortunately. See multiple comments on this site eg https://tex.stackexchange.com/questions/135944/commath-and-ifinner#comment307327_135944 – David Carlisle Oct 02 '18 at 16:39
@DavidCarlisle Yes I had trouble with commath, too. The \lVert works perfectly! Thanks a lot. – Luke Mathwalker Oct 02 '18 at 16:43

Aligned equation doesnt align properly

1 Answers1