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How can I write the symbol

enter image description here

for a proper ideal?

The standard relations \leq,\subseteq both have a "proper" version \lneq,\subsetneq, but I was unable to find a "proper" version of either \unlhd or \trianglelefteq.

Any suggestions?

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1 Answer

up vote 8 down vote accepted

You can do by superimposing the symbols:

\documentclass[a4paper]{article}
\usepackage{amssymb}

\newcommand{\properideal}{%
  \mathrel{\ooalign{$\lneq$\cr\raise.22ex\hbox{$\lhd$}\cr}}}

\begin{document}
$I\properideal A$
\end{document}

enter image description here

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great, thank you –  Leon Lampret Nov 6 '11 at 0:57
1  
Is there any other way of doing this? The $<$ bit of this symbol is bold when I put it into a document, which is less than ideal... –  user1729 May 9 '12 at 15:36
    
@user1729 Maybe a follow-up question with a minimal example is better. –  egreg May 9 '12 at 15:38
    
I was contemplating asking a new question, but I thought I would ask briefly here first. What do you mean by "a minimal example"? –  user1729 May 9 '12 at 15:43
    
An example of a .tex document that exhibits the problem, including all necessary packages. Don't forget a link to this question. –  egreg May 9 '12 at 15:50
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