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We all used \Delta for triangles. But is there a symbol for Parallelogram?

In a geometry topic with MathJax rendering engine, I wanted to use such symbol but couldn't find one.

Thanks a lot Stefan_K!

I'll play with the environment then.

Trying to enter a general linear system like this one.
linear-system-01.gif
But it turns out like this (see the extra spaces here and there).
linear-system-02.gif
Here is my code:
\[
\begin{array}{ccl}
a_{11}x_1 & + a_{12}x_2 + \cdots + & a_{1n}x = 0 \\
\;\vdots & &\quad\vdots \\
a_{m1}x_1 ...

I tried \frown {AB},\; \frown {ABC} for arc from A, B or arc determined by 3 points, but what is the proper way of tex them?

Thanks.

I found the msg below from web and so installed Latin Modern Roman using font book to the collection Modern. I don't know what else I can do though...


>> (/usr/local/texlive/2011basic/texmf-dist/tex/latex/euenc/eu1lmr.fd)kpathsea: Invalid fontname `[lmroman10-regular]', contains '['

This message ...

I'm looking for a small TeX package for OS X Lion.

I found BaseTeX and TeXShop solution which looks fit my preference since I just don't like 1.8Gb total solutions of MacTeX.

But I got errors for unicode content with BaseTeX, even simply compile the sample file shipped with BaseTeX in its ...

Thanks a lot nlct and Stefan_K! Very nice solution!

I don't know how to name it but wonder if the following can be specified by latex? Thanks for your advise

Thanks a lot Thorsten! Your code works very well. I'll read the manual and digest this.

I wonder what the LaTeX code for the expression looks like.
Any help is appreciated.