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There is a one sentence precise definition for a graph theoretical concept that I would like to copy more or less 1:1 into my paper. The only thing I change is some naming as "points" to "nodes" to fit it to the rest of the paper. Is this assumed plagiarism? The definition is short and precise. Changing words or replacing them would prolong the definition unnecessary. If taking the definition as it is would requiring me to reference it I would rather rewrite it and inflate it with words. On the other hand wikipedia hasn't referenced where they have taken the definition from and they are not the first to use it. (Can say so for sure, because it has been around long before.)

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Plagiarism is copying text from another source without (proper) attribution. As a quotation, you can put text from outside sources into you paper verbatim if is marked as such (see example).

"A quotation is the repetition of a sentence, phrase, or passage from speech or text that someone has said or written." Wikipedia,2021

If you slightly adjust the text, leave out the quotation marks but still reference the source:

Repeating parts of written or spoken information is considered a quotation Wikipedia,2021.

Same goes for definitions.

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    @baxbear I feel like you're misunderstanding how attribution means. Let's assume the idea "originates" in source X and can be traced to it. You read source A which cites source B which cites source C... All the way back to X. It might be a good idea to cite X if you can find it but it is fine to cite A where you read it instead. On wiki, most of the content is supposed to be original to some degree (at least, in terms of writing), rest is covered by citations. So, you're supposed to cite the wiki in your situation. Caveat: it might appear unprofessional if better sources are well-known.
    – Lodinn
    Nov 8 '21 at 10:38
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    Actually plagiarism is not about "copying text". It is about misattribution of ideas, no matter how stated. You can paraphrase and still plagiarize. Copyright, not plagiarism, is about "text".
    – Buffy
    Nov 8 '21 at 11:17
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    You can't plagiarize common knowledge, though you can try, and the precise expression of it can't be copyrighted either. If I say that I invented general relativity, I'm a fool, but not a plagiarizer. I can copy precisely the definition of the derivative (from calculus) from a copyrighted textbook without breaking copyright law. Common knowledge is held in common. Most of what is in wikipedia is common knowledge (if only to to experts, perhaps). See: en.wikipedia.org/wiki/Wikipedia:No_original_research
    – Buffy
    Nov 8 '21 at 11:21
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    @baxbear, that all seems like common knowledge, but if you quote it literally it would be good to cite it to avoid confusing people. There might be other reasons to point to wikipedia articles for such things, even when paraphrased, to help readers get some context for your work without needing to find original sources. Note, in particular, that wikipedia itself doesn't cite any source for the definitions (but does for applications and analysis).
    – Buffy
    Nov 8 '21 at 11:52
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    @Buffy If one quotes another's writing verbatim, it's not "good to cite it;" citation is required.
    – Bob Brown
    Nov 9 '21 at 0:07
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Generally speaking, what you find in wikipedia is "Common Knowledge". Wikipedia isn't intended to contain original research or even creative ideas. It presents facts that are known and tries, in many cases, to show where the ideas came from.

What you read there is technically copyrighted, but with a broad license for reuse: https://en.wikipedia.org/wiki/Wikipedia:Copyrights. It is, in fact, intended for reuse.

There is actually a prohibition against posting original research there (https://en.wikipedia.org/wiki/Wikipedia:No_original_research) and, when it is found, it is first marked and then removed.

Therefore, the ideas you get in wikipedia are free to use and plagiarism isn't an issue. However, if you quote from wikipedia you need to cite it. This is actually the same as quoting from any copyrighted work. You quote to indicate that the words came from elsewhere and you cite to make the source clear.

Citation, even of wikipedia, is a benefit to the reader who seeks, in most cases, not only your words, but context in which your words are developed. Wikipedia in general, especially for scientific articles, is good about providing such context.

So, I suggest that you cite wikipedia (judiciously) just as a service to readers, though a search of the scientific terms you use will probably turn up related wikipedia articles as top level hits.


Note that plagiarism is about ideas, not "text". I can plagiarize using literally none of the words in the original. It is misattribution of ideas. Copyright is about the specific expression of those ideas. It is a different concept. If I steal words from a copyrighted source, then I might break copyright, but maybe not plagiarize (common knowledge).


I'll also note that some people are confused about the definition of plagiarism and the other things that govern IP.

Unfortunately, in the context of a classroom, when an instructor sets the rules, things can get confusing, as what is called plagiarism there may not actually be that. It is used as a catch-all for lots of things that involve improper (in the class context) copying. But, I can't "plagiarize" by copying a bubble sort program, since bubble sort is common knowledge, though maybe not to students. I can certainly break the professor's rules, of course.

So, some people get the idea that plagiarism is about the words. It isn't. It is about the ideas behind the words.

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