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QED symbol for end of proof

The amssymb \LaTeX package defines a default Halmos symbol that automatically appears when you use the proof environment. That default Halmos symbol is \Box. But if you want that to be filled with black, you could redefine the Halmos symbol. Put the following in your preamble:

\renewcommand{\qed}{\hfill \mbox{\raggedright \rule{0.1in}{0.1in}}}

Better still, you could customize what symbol you want to use as your QED symbol. Just replace the macro \rule{0.1in}{0.1in} with the the symbol of your choice.

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