# Is there a nice way to make a strikethrough for the square subset character in LaTeX?

I am working on some math that uses the square subset notation. I need a good way to strikethrough the character in LaTeX.

I have tried using the package "cancel" but the strikethrough it produces for the squaresubset character is ugly and looks out of place relative to ⊈ which looks quite nice.

You can prefix most mathematical symbols with \not in order to negate them. The following looks good according to me:
\documentclass{minimal}
Did you know that $\mathcal{A}\sqsubseteq\mathcal{B}$? However, $\mathcal{A}\not\sqsubseteq\mathcal{C}$. Also, $\mathcal{C}\not\subseteq\mathcal{D}$.

Alternatively, as suggested by @Alan, there are some variants to this (as well as complete symbols) as part of txfonts/pxfonts, mathabx and mnsymbol packages. See the page 37 of Scott Pakin's Comprehensive LaTeX Symbol List for more details.
• Note that I mention most mathematical symbols. That is, you may find some symbols (perhaps very size dependent) do not have a 'perfect' look when negating them with \not. – Werner Jul 26 '11 at 17:46