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Is there a symbol for "non-transversality" (or how to create it)? I am thinking about something similar to the negation of the symbol \pitchfork. I did not find anything like this in the list of available symbols.

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5  
Have you tried \not\pitchfork? BTW, Welcome to TeX.SE. –  Peter Grill Feb 7 '12 at 16:03
    
Welcome to TeX.sx! Usually, we don't put a greeting or a "thank you" in our posts. While this might seem strange at first, it is not a sign of lack of politeness, but rather part of our trying to keep everything very concise. Upvoting is the preferred way here to say "thank you" to users who helped you. –  Roelof Spijker Feb 7 '12 at 16:13
    
@PeterGrill ok, I didn't know the \not command, it seems very useful –  vito Feb 9 '12 at 23:12
    
@wh1t3 fine....thanks ;) –  vito Feb 9 '12 at 23:14

3 Answers 3

If you're interested in extracting only the symbol you're after from MnSymbol, then you can follow the procedure listed in Interior product (contraction) symbol.

Here is an MWE that defines \nontrans as a binary relation:

enter image description here

\documentclass{article}
\usepackage{amsmath}% http://ctan.org/pkg/amsmath
\usepackage{fonttable}% http://ctan.org/pkg/fonttable
\DeclareFontFamily{U}{MnSymbolB}{}
\DeclareSymbolFont{MnSyB}{U}{MnSymbolB}{m}{n}
\DeclareFontShape{U}{MnSymbolB}{m}{n}{
    <-6>  MnSymbolB5
   <6-7>  MnSymbolB6
   <7-8>  MnSymbolB7
   <8-9>  MnSymbolB8
   <9-10> MnSymbolB9
  <10-12> MnSymbolB10
  <12->   MnSymbolB12}{}
\DeclareMathSymbol{\nontrans}{\mathbin}{MnSyB}{'211}% Symbol 211
\begin{document}

$A\nontrans B$

\end{document}

In fact, \nontrans is symbol '211 (octal, or decimal 137) from MnSymbolB. Here's the font table if you're interested in extracting a different symbol:

enter image description here

The above font table was created via the fonttable package and adding

\xfonttable{U}{MnSymbolB}{m}{n}% MnSymbolB font table

to the above MWE.

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Well done! I would just add that for consistency it is probably good to use the symbol for \pitchfork from MnSymbol as well (it is in MnSymbolA font I believe). –  tohecz Feb 9 '12 at 7:04

The MnSymbol Pitchforks provides \nuppitchfork found in The Comprehensive LATEX Symbol List by Scott Pakin on page 47.

example

EDIT:

To create a similar effect, try the following though to my knowledge it is not the most appropriate Latex way of negating a Math Symbol:

 \documentclass[letterpaper]{article}
 \usepackage{mathabx}
 \begin{document}
 \makebox[1em]{$\pitchfork$}\hspace{-1em}\makebox[1em]{/}
 \end{document}

Which produces: test

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2  
beware the side effects of mathabx; it changes the shape of many symbols. if just one or two symbols are needed, there is a "recipe" for accomplishing that in an answer to this question. –  barbara beeton Feb 7 '12 at 17:57
    
I suppose so, my suggestion is just a sample with a \pitchfork without negation. –  azetina Feb 7 '12 at 18:05
    
but a \pitchfork does require a package that provides the symbol. the package shown in your example is mathabx. (this symbol is also provided by \usepackage{amssymb}, which conflicts with none of the "standard" computer modern symbols. there may be others that don't have such a wide-reaching scope, but i haven't checked.) –  barbara beeton Feb 7 '12 at 19:04
    
MnSymbol is a package that provides really a lot of symbols, but changes the appearance of a lot of symbols. I would really need some option passed to that package, so that I can write e.g. \Mn{\pitchfork} to get the one from MnSymbol package and without \Mn to get the symbols as usual. –  tohecz Feb 8 '12 at 9:01

I guess that the following code gives pretty good results, that are consinstent while scaling. (We made an \overline over something that has a width of the symbol and height of a single ..)

\documentclass[12pt]{article}

\usepackage{amssymb}
\def\npitchfork{\mathrel{\overline{\vphantom{.}\smash{\pitchfork}}}}

\begin{document}

\[
A \npitchfork B_{{X\npitchfork Y}_{M\npitchfork N}}
\]

\end{document}
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