Latex Error Environment Align Undefined

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\usepackage{amsmath}

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Latex Align Environment

ask a question Anybody can answer The best answers are voted up and rise to the top Environment align undefined line 11, all I can see to do is to retype the line and it still isn't working up vote 7 down vote favorite \documentclass [12pt]{article} \oddsidemargin=0pt \topmargin=0pt \textwidth=6.5in \textheight=8.5in \begin{document} \begin{center} {\large\bf\LaTeX\ Example 8} \end{center} Sometimes we have to typeset a sequence of calculations: \begin{align} \sum_{r=1}^k\left( latex align equal signs l(r)-l(r-1)\right) &= \sum_{r=1}^k\left(N-2r+1\right) \\ &= k(N+1)-2\sum_{r=1}^kr \\ &= k(N+1)-k(k+1) \\ &= k(N-k) \end{align} \begin{quote} \begin{verbatim} \begin{align} \sum_{r=1}^k\left( l(r)-l(r-1)\right) &= \sum_{r=1}^k\left(N-2r+1\right) \\ &= k(N+1)-2\sum_{r=1}^kr \\ &= k(N+1)-k(k+1) \\ &= k(N-k) \end{align} \end{verbatim} \end{quote} Here is another way: \begin{eqnarray*} \sum_{r=1}^k\left(l(r)-l(r-1)\right) &=& \sum_{r=1}^k\left(N-2r+1\right) \\ &=& k(N+1)-2\sum_{r=1}^kr \\ &=& k(N+1)-k(k+1) \\ &=& k(N-k) \end{eqnarray*} \begin{quote} \begin{verbatim} \begin{eqnarray*} \sum_{r=1}^k\left(l(r)-l(r-1)\right) &=& \sum_{r=1}^k\left(N-2r+1\right) \\ &=& k(N+1)-2\sum_{r=1}^kr \\ &=& k(N+1)-k(k+1) \\ &=& k(N-k) \end{eqnarray*} Observations: \begin{itemize} \item The eqnarray environment is a displayed array with three columns. It is aligned on the center column. \item The \verb+*+ supresses the generation of equation numbers. \end {itemize} ---Britney Wiggins \end{document} math-mode errors share|improve this question edited Sep 6 '13 at 20:26 Martin Schröder 11.1k43194 asked Sep 6 '13 at 7:53 Britney Wiggins 122115 1 Add the amsmath package in your preamble and do not forget to end the verbatim and quote environments at the end. –Ludovic C. Sep 6 '13 at 7:59 Use »geometry« to specify the paper and page dimensions. –Thorsten Donig Sep 6 '13 at 9:49 3 Sorry to bother you. Don't forget that you can accept answers (that you consider solved your problems) by clicking the checkmark to the left of the answer.

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Latex Equation Align Left

more about Stack Overflow the company Business Learn more about hiring developers or posting alignat ads with us TeX - LaTeX Questions Tags Users Badges Unanswered Ask Question _ TeX - LaTeX Stack Exchange is a question latex split and answer site for users of TeX, LaTeX, ConTeXt, and related typesetting systems. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The http://tex.stackexchange.com/questions/131841/environment-align-undefined-line-11-all-i-can-see-to-do-is-to-retype-the-line-a best answers are voted up and rise to the top Environment aligned undefined when trying to write a system of equations up vote 2 down vote favorite I'm trying to write a system of equations in LaTeX. From the Wiki page Advanced Mathematics I took this example: \begin{equation} \left.\begin{aligned} B'&=-\partial \times E,\\ E'&=\partial \times B - 4\pi j, \end{aligned} \right\} \qquad \text{Maxwell's equations} \end{equation} but as a result I got: ! LaTeX http://tex.stackexchange.com/questions/144933/environment-aligned-undefined-when-trying-to-write-a-system-of-equations Error: Environment aligned undefined. See the LaTeX manual or LaTeX Companion for explanation. Type H for immediate help. ... l.49 \left.\begin{aligned} Does anybody know what goes wrong here? errors equations share|improve this question edited Nov 18 '13 at 20:58 Martin Scharrer♦ 162k30517696 asked Nov 14 '13 at 6:42 Roman 3561510 1 Please provide a minimal working example. We can definitely assist you better in that way. More than likely, from the error message, your missing the amsmath package which defines the aligned environment. –azetina Nov 14 '13 at 20:24 add a comment| 1 Answer 1 active oldest votes up vote 3 down vote I found the answer: \usepackage{amsmath} share|improve this answer answered Nov 14 '13 at 6:44 Roman 3561510 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Email and Password Post as a guest Name Email Post as a guest Name Email discard By posting your answer, you agree to the privacy policy and terms of service. Not the answer you're looking for? Browse other questions tagged errors equations or ask your own question. asked 2 years ago viewed 3975 times active 2 years ago Get the weekly newsletter! In it, yo

Wiki Navigation On the Wiki Wiki Activity Random page Videos Images Popular pages Most visited articles Percent sign (LaTeX symbol) List of LaTeX symbols Main page Sum-class symbol Int (LaTeX symbol) Align (environment) Array http://latex.wikia.com/wiki/Align_(environment) (LaTeX environment) LaTeX template Multicol Multicol-break Multicol-section Multicol-end Table (LaTeX environment) UsageTable-row Lenv Environment Align (environment) Cases (LaTeX environment) Tabular (LaTeX environment) List of LaTeX environments Array (LaTeX environment) Matrix environments Matrix (LaTeX environment) Community Recent blog posts Contribute Edit this Page Add a Video Add a Photo Add a Page Wiki Activity Watchlist Random page Recent changes Align (environment) 137pages on this wiki Edit Classic editor History Talk0 The align environment latex align is used for two or more equations when vertical alignment is desired; usually binary relations such as equal signs are aligned. American Mathematical Society, User's Guide for the amsmath Package For all intents and purposes, it's a replacement for the eqnarray environment and all its warts. Rather than \begin{eqnarray*} x^2 + y^2 &=& 1 \\ y &=& \sqrt{1 - x^2}, \end{eqnarray*} Contents[show] one can type Edit \begin{align*} x^2 + y^2 &= latex error environment 1 \\ y &= \sqrt{1 - x^2}. \end{align*} Benefits over eqnarray Edit Besides the slightly simpler syntax, you side-step bugs documented by Lars Madsen for The PracTeX Journal: Inconsistent spacing around binary symbols like = and +; Overwriting equation numbers; and Silent label mismatch. Multiple equations on one line Edit Besides being used for aligning binary symbols, the ampersand can also mark an invisible alignment for separating columns of equations. For example, \begin{align} u &= \arctan x & dv &= 1 \, dx \\ du &= \frac{1}{1 + x^2} dx & v &= x. \end{align} produces: Preamble Edit To use align, import the amsmath package in your preamble. ..... \usepackage{amsmath} ..... \begin{document} \begin{align*} u &= \arctan x & dv &= 1 \, dx \\ du &= \frac{1}{1 + x^2} dx & v &= x. \end{align*} \end{document} Retrieved from "http://latex.wikia.com/wiki/Align_(environment)?oldid=4133" Categories: AMS-LaTeX Environment Add category Cancel Save Also on Fandom Random Wiki Games Movies TV Explore Wikis Follow Us Overview About Careers Press Contact Wikia.org Terms of Use Privacy Policy Global Sitemap Local Sitemap Community Community Central Support Fan Contributor Program WAM Score Help Can't find a community you love? Create your own and start something epic. Start a wiki Community Apps Take your favorite fandoms with you and never miss a beat. Adver