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1. math.stackexchange.com › questions › 56606Why does drawing $\\square$ mean the end of a proof?

   math.stackexchange.com › questions › 56606

   Apr 21, 2017 · Strictly speaking, "q.e.d." (as stated) means something like "as was to be shown", so (strictly) it is only appropriate if the last thing in your proof, indeed, was the thing to be shown. In Euclid, for example, the last thing is every proof is a re-statement of the theorem.

2. en.wikipedia.org › wiki › QQ.E.D. - Wikipedia

   en.wikipedia.org › wiki › Q

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   Q.E.D. or QED is an initialism of the Latin phrase quod erat demonstrandum, meaning "that which was to be demonstrated". Literally, it states "what was to be shown". [1]

3. superuser.com › questions › 360517What disk image should I use with VirtualBox, VDI, VMDK, VHD ...

   superuser.com › questions › 360517

   Nov 23, 2011 · VDI, VMDK, and VHD all support dynamically allocated storage. VMDK has an additional capability of splitting the storage file into files less than 2 GB each, which is useful if your file system has a small file size limit. HDD, QCOW, and QED have to be dynamically allocated if created in VirtualBox. be able to have snapshots.

4. stackoverflow.com › questions › 25478682What is the difference between "Qed" and "Defined"?

   stackoverflow.com › questions › 25478682

   Aug 25, 2014 · (More formally, Defined marks an identifier as transparent, allowing it to be unfolded; while Qed marks an identifier as opaque, preventing unfolding.) However, I'm not quite sure what this means in practice.

5. www.mathsisfun.com › definitions › qedQED Definition (Illustrated Mathematics Dictionary) - Math is Fun

   www.mathsisfun.com › definitions › qed

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   QED. Short for the Latin phrase "quod erat demonstrandum" meaning "that which was to be demonstrated". Used at the end of a proof to show it is completed. Also written Q.E.D. Example: If m is an even integer, then m 2 is even. Proof: By definition of an even integer, there exists an integer n such that m = 2n.

6. tex.stackexchange.com › questions › 654410equations - \qedhere behavior in different environments - TeX ...

   tex.stackexchange.com › questions › 654410

   Aug 18, 2022 · I am wondering about why it behaves differently in different environments. Apparently, \qedhere does not work in an equation environment, when using the showonlyrefs feature from the mathtools package? I get the following error: A <box> was supposed to be here. \end{equation}

7. People also ask

   What is the difference between QED & box?

   • Some authors use Q.E.D. as that mark, some authors use the box. There is no difference in meaning, which one is used is just a stylistic choice of the author. Per your edit: The box $\Box$ is actually called a tombstone. It had long been used in magazines to indicate the end of an article.

   terminology - What is the meaning of the expression Q.E.D.? Is it

   math.stackexchange.com/questions/1155623/what-is-the-meaning-of-the-expression-q-e-d-is-it-similar-to-appearing-at-th

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   What does QED mean in a proof?

   • Modern textbooks often conclude proofs with “which concludes the proof” or “which proves the assertion” or something. It’s the same thing, “QED” and the square are just convenient shorthands. Mathematicians write "QED" in a proof when they don't feel like writing any more. It is part of the grammar of mathematical writing/discourse.

   What are the advantages of ending a proof with “QED”?

   math.stackexchange.com/questions/3246207/what-are-the-advantages-of-ending-a-proof-with-qed

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   What does QED mean in a text book?

   • It marks the end of proof, which is quite useful in a text book. And the obvious answer is that it is simply good style to let your readers know that you consider a statement to be proven now. As you know “QED” means “quod erat demonstrandum”, that is “what was to be shown”. It makes proofs more readable.

   What are the advantages of ending a proof with “QED”?

   math.stackexchange.com/questions/3246207/what-are-the-advantages-of-ending-a-proof-with-qed

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   What does QED stand for?

   • For other uses, see QED. Q.E.D. or QED is an initialism of the Latin phrase quod erat demonstrandum, meaning "that which was to be demonstrated". Literally, it states "what was to be shown". [ 1 ]

   Q.E.D. - Wikipedia

   en.wikipedia.org/wiki/Q.E.D.

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   Why is QED important?

   • The key thing is that it costs little and adds to efficiency and accuracy of communication. QED is short for the Latin phrase quod erat demonstrandum and means, loosely, "that which was to be shown". As noted in the comments, it's a summary way of saying that the proof is concluded.

   What are the advantages of ending a proof with “QED”?

   math.stackexchange.com/questions/3246207/what-are-the-advantages-of-ending-a-proof-with-qed

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   Why do mathematicians write QED in a proof?

   • Mathematicians write "QED" in a proof when they don't feel like writing any more. It is part of the grammar of mathematical writing/discourse. A proof is a key unit of mathematical discourse. It is important therefore to have efficient markers of the beginning and end of the unit. It doesn't matter what these are - the specifics are arbitrary.

   What are the advantages of ending a proof with “QED”?

   math.stackexchange.com/questions/3246207/what-are-the-advantages-of-ending-a-proof-with-qed

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8. physics.stackexchange.com › questions › 178068What is the difference between QED and quantum optics?

   physics.stackexchange.com › questions › 178068

   In particle physics, quantum electrodynamics (QED) is the relativistic quantum field theory of electrodynamics. One is a theory (QED) and the other is a field of (especially also experimental and phenomonological) research, using among other tools QED.