That's a singlet (entangled) state. Everyone who creates any kind of HTML pages can include mathematical equations like one above using the following tag:
- <img src="http://shitalshah.com/?$3+3=6$">
Unfortunately, the images cannot be included in the comments at blogs run by blogger.com.
Also, I can't offer you LaTeXrender used by Peter Woit because this blog is not based on the software by WordPress. But it is likely that if I need some mathematical expressions that look really unacceptable in the ASCII format, I will be using Shital Shah's solution instead of the previous plugin.
I don't plan to increase the amount of LaTeX - in whatever format you can think of - on these pages. And I am jealous about the WordPress LaTeXrendering feature.
Update:
AlJazeera argues that only string theory has the right to destroy what God has created.
LaTeX preview
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Moreover, don't forget that if you choose the Siegel gauge, every nontrivial string field theory amplitude contains as part of its expression