I recently read a dissertation where I recognized sentences that appeared in earlier papers but are not cited in the dissertation. Here are some of these sentences. He also appears to be copying from flashcards , also without citations.

Does this constitute plagiarism?

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    Was it all from the same author? – Buffy Sep 10 '20 at 21:28
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    Depends on what you mean. The sentences are all in his thesis but none originates with him. He has republished parts of his thesis but that is irrelevant. – MSD Sep 10 '20 at 22:59
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    I would say yes. The last example is particularly egregious. – user117751 Sep 11 '20 at 0:43

Yes, the use of unattributed material, or use of quotes without indicating they are quotes even with attribution, is plagiarism.

If it's just a few sentences in a long dissertation, it's plausible that some of it was due to lazy note-taking, like copying the words of others into an intermediate document and not realizing months or years later that they were copied. However, laziness is not really a defense. Maybe a mitigating factor.

  • I am not sure if it's due to lazy note-taking. The person who did it has a history of plagiarism. It seems to me that he did his appropration of sentences quite skillfully in his thesis since plagiarism detectors find rather few copied material but a manual sentence by sentence (or parts of a sentence) search reveals that he took a lot of sentences (consecutive 7-9 words) without citation . What is the likely outcome if I report this to the dept chair of the university of his thesis? – MSD Sep 11 '20 at 6:54
  • @MSD That depends entirely on the dept chair. – Bryan Krause Sep 11 '20 at 13:01

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