Can I use paragraphs from an already published article in a new article? Can I use paragraphs from an already published article in a new article?
I want to repeat some ideas as an introduction and there is no point in re-writing them when I already reached my desired precise expression. I have the copyright of the original article (but I guess the journal that published it has rights on its distribution).
No. That's self-plagiarism and most venues will not accept it. It is flagged by plagiarism-detecting software, and is likely to lead to desk rejection.