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4

How do I type a QED symbol - I want a full box and not an empty box like \qed gives you. (I'm not using \begin{proof})

A: 

Use \blacksquare.

Sinan Ünür
+1  A: 

What about \blacksquare? http://amath.colorado.edu/documentation/LaTeX/Symbols.pdf

John at CashCommons
is there a reason this won't work? do I need to import anything? (`\square` works fine)
Guy
Oh ok ... \square in the link I gave you is a white square. Thought you wanted a fileed-in square.
John at CashCommons
+2  A: 

A good reference for finding any symbol in LaTeX is http://detexify.kirelabs.org/classify.html - just draw what you want to find, and it will show you a list of potential symbols.

Mike
that's the coolest thing ever!
Guy
+1  A: 

If you \usepackage{amsmath}, the \blacksquare command will typeset a solid black square. The \square command will give you a hollow square.

The ulsy package has a few version of the lightning bolt for contradictions: \blitza, \blitzb, ..., \blitze. Just drop \usepackage{ulsy} into the preamble of your document.

Finally, as others have pointed out, the Comprehensive LaTeX Symbols List is a great resource for finding the perfect symbol for the job.

godbyk