Latex Undefined

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Tags: LaTeX Error: Environment tikzpicture undefined, LaTeX Error: Environment split undefined, LaTeX Error: Environment theorem undefined, LaTeX Error: Environment maplelatex undefined, LaTeX Error: Environment minipage* undefined, LaTeX Error: Environment maplegroup undefined, LaTeX Error: Environment mapleinput undefined, LaTeX Error: Environment biblio_lat undefined, LaTeX Error: Environment flalign undefined, LaTeX Error: Environment align* undefined, LaTeX Error: Environment comment undefined, LaTeX Error: Environment figure* undefined, LaTeX Error: Environment algorithm undefined, LaTeX Error: Environment align undefined, LaTeX Error: Environment adjustbox undefined
This error will appear when LaTeX is unable to understand the command you may have used.
doc.tex, line 5
LaTeX Error: Environment equation* undefined.
See the LaTeX manual or LaTeX Companion for explanation. Type H for immediate help. ... l.5 \begin{equation*} Your command was ignored. Type I to replace it with another command, or to continue without it.


When you are trying to make use of an environment which is part of a specific package, and you forget to load the package in your preamble, an error will occur. For example, the align environment. The align environment is a part of amsmath package. So, if you want to use the align environment, it is necessary to include \usepackage{amsmath} in the preamble.
% Preamble
 
\usepackage{amsmath}
 
% In your main.tex file
 
\begin{align}
5x + 7y &= 8\\
6x - 4y &= 9
\end{align}

In the case when \usepackage{amsmath} is not included in your preamble, an error message will be generated.
Another reason for this error is when you spell the environment incorrectly. For example,
\begin{lisY}
\item First list item
\item Second list item
\end{lisY}

The above lines will throw an error because there is a spelling mistake as instead of list, lisY is written. To avoid this, check the spelling while using environments.
The error may also occur if you try to use the environment which does not exist.

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this is how my file starts. I didn't even edit it, I received it like this. However, if I want to make a pdf, it gives me the undefined control sequence error at the first line... What is wrong??
MJB
MJB 3,774●99 gold badges●4343 silver badges●7070 bronze badges
How do you invoke LaTeX? – Svante Apr 27 '10 at 21:42
what do you mean by "how do you invoke latex"? how I open the file? it's a tex file I just double click and open with TexShop (Mac) – MJB Apr 27 '10 at 22:28
My guess is that you're trying to use TeX instead of LaTeX. TeX won't recognize the \documentclass command. Make sure you use LaTeX.
Rob Hyndman
Rob Hyndman 26.4k●77 gold badges●6363 silver badges●8282 bronze badges
I fixed the problem by using a different editor, and now also the other editor works. however, I get a "messed up" pdf file, with blank pages and pagenumbers at the upper left (not intended).. – MJB Apr 28 '10 at 8:57
It might be that one of the tools in your tool chain gets irritated by a Byte-Order Mark (BOM), which is a special Unicode character to indicate the endianness used in your file.
Unfortunately, a BOM may have unwanted side-effects.
You might try to save the file with another editor which won't add this mark in the beginning, or remove it with a hex editor.
Dirk Vollmar
Dirk Vollmar 161k●5252 gold badges●243243 silver badges●303303 bronze badges
tried a different editor and it worked. however the pdf file seems to be pretty messed up. Could it be that BOM, or "not" BOM, has had influence on this? thx – MJB Apr 27 '10 at 22:27
What does "messed up" mean? Do you see any characters? Empty pages? Images? If it is just the layout that is not nice, I assume this is due to different LaTeX packages (speculating). – Dirk Vollmar Apr 27 '10 at 22:48
Yes empty pages, the footnotes are at the upper left. sometimes the table of contents is not displayed.after every included file, there is blank page. – MJB Apr 27 '10 at 23:09
@Jayomat: This looks rather like a problem with your document/your LaTeX version. I doubt this is related to the BOM as an incorrect endianness would rather result in no PDF being created at all. – Dirk Vollmar Apr 28 '10 at 7:59
try getting rid of \usepackage[dvips]{epsfig,psfrag} if you're using pdflatex.
Mica
Mica 15.9k●44 gold badges●4040 silver badges●4141 bronze badges
alright... maybe you should read some introductory material. dvips is one of the back-end drivers used to create .dvi files. You're loading two packages meant for dvi or ps graphics, and you're trying to produce a pdf-- pdflatex doesn't accept any postscript or eps figures (tiff, pdf, jpg, and png for pdflatex). – Mica Apr 27 '10 at 22:54
you need to provide more information... what tex distribuition are you using? what editor? are you using latex or pdflatex? – Mica Apr 27 '10 at 23:15
I use MacTex2009.. it's 1,4 Gb.. TexLive2009 should be the distribution.. I use TexShop as an Editor and LaTeX to make the file.. I got a second editor, TexWorks where I use pdfLaTeX.. I get the same results no matter which editor I chose – MJB Apr 27 '10 at 23:20
Perhaps TeXshop doesn't recognize your file as a LaTeX file and runs it with plain TeX or ConTeXt. If you can post your logfile (the beginning) here, we can help you for sure.
topskip
topskip 13.3k●1414 gold badges●6262 silver badges●8686 bronze badges
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