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I use MathJax on my Website which unfortunately doesn't support the use of \qed to create QED symbols.

So what I'm looking for is a way of recreate or rebuild the little square \qed usually offers.

I thought of aligning the \Box under the current line, but I don't know how..

Any suggestions?

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Would you be able to provide a link to something you want to recreate? Or perhaps an image (even if you just post a link to the image; editors will embed the image in your post if needed). I am very unfamiliar with MathJax and therefore do not know much about answering this question; that is, whether this is website or (La)TeX-related. –  Werner Feb 2 '12 at 19:46
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Since it is on a web page, best way is to use the unicode character U+220E. –  Yiannis Lazarides Feb 2 '12 at 19:47
    
@Yannis: Good one! And its Unicode name is END OF PROOF even … I had no idea it existed. It looks like this: ∎ –  Harald Hanche-Olsen Feb 3 '12 at 21:59
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2 Answers

Just to turn my comments into an answer to try and close the question. Since MathJax is used on web pages the easiest way to add the QED sign is to use the unicode symbol for end of proof, which looks like this: ∎; The unicode character U+220E. Just type ∎ and if it need be enclose it within a span element.

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In a paragraph, append <span style="float:right">∎</span>. Creating a CSS class for it is even better.

In a display equation, hack it with \tag*{∎}.

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