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Tombstone (typography)
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The tombstone, halmos, or end of proof mark "□" is used in mathematics to denote the end of a proof, in place of the traditional abbreviation "QED" for the Latin phrase "quod erat demonstrandum" (Q.E.D.).
In Unicode, it is represented as character U+220E "End of Proof". Its graphic form varies. It may be a hollow or filled rectangle or square.
In AMS-LaTeX, the symbol is automatically appended at the end of a proof environment begin{proof} ... end{proof}. It can also be obtained from the commands qedsymbol or qed (the latter causes the symbol to be right aligned).
It is sometimes called a halmos after its eponym Paul Halmos, who first used it in mathematical context, after seeing it was being used to indicate the end of articles in magazines.
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Last updated on Monday January 28, 2008 at 07:03:25 PST (GMT -0800)
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This article is licensed under the GNU Free Documentation License.
Last updated on Monday January 28, 2008 at 07:03:25 PST (GMT -0800)
View this article at Wikipedia.org - Edit this article at Wikipedia.org - Donate to the Wikimedia Foundation
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